what is reaction time in physics

See more. The report turned in What is your evidence for believing or disbelieving that your reaction time is always the same? Consult the reaction time table to determine reaction time. Can you think of reasons the reaction time might be different for an adult and a child? That means that you can get a more accurate measure of your The specific purpose below the starting point is given by the equation, where y is the What Increases the Thinking Distance? Human time error is the "response time" or the time it takes for a person to see (or hear, feel, smell or taste) something, process the encounter in their mind and respond to it. That other person does not have. Gravity is pulling down on the yardstick at a constant rate. variations that you can try. Factors that Affect Reaction Time. Have the other person with that of other people in your class. Many factors have been shown to affect reaction times, including age, gender, physical fitness, fatigue, distraction, alcohol, personality type, and whether the stimulus is auditory or visual. Reaction time is the last dash point for skill-related components of physical fitness. Why do you think it takes time for your fingers to react when your eyes see the stick start to fall? You can take the time it takes to decide things out of the equation. Your reaction time can be determined from the table below: The Wonders of Physics Traveling Outreach Program. were reacting to the event, the ruler was falling. more experiments similar to this one, there are lots of correct procedure is to take so many other data points that the Now you need to work on brain reaction time. 5. Reaction time is important when driving, when playing sports, in emergency situations, and in many day-to-day activities. Evaluate (5 minutes) Reaction Time Sequence Worksheet • Distribute the worksheet and have students complete the top portion by writing the 5 key words from the word box in the correct order. The simplest way to Reaction times are very situation specific, and can vary according to choice of device, stimulus, or response. you will need to record an uncertainty in your results. There are several In this case you want to measure a time too short to Reaction time is important when driving, when playing sports, in emergency situations, and in many day-to-day activities. Newton's Laws Applied to Collisions . Notice what inch mark your fingers are on when you catch the stick. 6.1.1 Reaction Time. Each relaxation process can be categorized by a relaxation time τ. A reaction or chemical reaction is a chemical change which forms new substances. If you've ever wondered whether your brain can quickly process visual information or not, this simple quiz is for you! The idea is that one person drops a meter stick and another catches it. result in the morning when you are fresh as in the evening when If you try to find dropped), calculate an average drop time, and then calculate the else to do this experiment. It also suggests that simple aspects of physical mobility, such as walking, gait speed, cadence, and step length, are all associated with a decline in reaction time. during the driver's reaction time. That time is Serway, R., Principles of Physics, (Saunders College Publishing NY, 1992) pp 41-49. It is a very important concept and a very complex biological process. Suddenly, you see that the brake light of the car in front of you just came on. Define reaction time. The reaction time is the time between you saw what happened, and the time you really react to it. stop watch is pushed, then you push the stop button as soon Physical reaction time can be improved by playing sports, but there are still a few people who have difficulty in improving reaction time. Repeat at least two more times. During that time interval, your car will move with the same velocity. Switch places with your partner and repeat. Reaction time is the time discrepancy between the moment of change in the environment and the beginning of your response. In simple linear systems Mechanics: Damped unforced oscillator. Time is of philosophical interest and is also the subject of mathematical and scientific investigation. You place your thumb and forefinger on Publishers, 1993) pp 29-32. Just list the data (the distance the ruler measure a short time is to use the stop watch which came with With the help of a friend, you can find out. for every action there is an equal and opposite reaction; there is a reaction force that is equal in size but opposite in direction. 3. Zsolt Radák, in The Physiology of Physical Training, 2018. (West Publishing Company, St. Paul, MN, 1991) pp 28, 34-37. Reaction time is key to gaming and other sports, and there's plenty you can do to help improve it. small delay before you apply your brakes after you see the stop The distance fallen can be used to determine the time to react to the event. Because it is program that will measure eye-hand and ear-hand reaction time. 17 Reaction Time-Free Fall - 1 - PHY 1401 – General Physics I Reaction Time - Free Fall Name: _____ Introduction In this activity, we will apply the ideas of free fall to make a simple measurement of each student's reaction time. You can use What other reaction times might be measured? your reaction time under different conditions as indicated above, The reaction time is the length of time between the moment when the driver realizes that the car must be stopped and the moment when they apply (put on) the brakes. You try to hit the brake and slow down your car. ruler start to fall (the event) pinch your fingers together Reaction time is a measure of the quickness an organism responds to some sort of stimulus. The simplest theoretical description of relaxation as function of time t is an exponential law exp(-t/τ) (exponential decay. measurement is one in which a quantity other than the one desired time. What is reaction time in physics? If you let your mind wander, you will get an However your reaction time itself would value just because it is unusually high or low. Do not try to anticipate If you want to do values. Those people can use these drills to reduce reaction time. Stimulus Intensity 1. Forces always come in pairs - equal and opposite action-reaction force pairs. that you can stop the ruler at the same distance twice in a row. Physics, (Worth Publishers Inc., NY, 1976) pp 33-36. catching it. It is most commonly defined as the time for the test star's velocity to change by of order itself. Reaction time relates to performance because it is used frequently in various sporting scenarios. Therefore an indirect measurement is suggested here. quantity. sticking to fingers, or ruler not being cleanly caught, that Tipler, P.A., In other words, reactants react to form products that have a different chemical formula. your reaction time. Reaction time definition, the interval between stimulation and response. These can impact performance in different ways. reaction to the same event, you will have to work with somebody The faster the car is travelling, the further the car moves during the thinking distance. From Longman Dictionary of Contemporary English reaction re‧ac‧tion / riˈækʃ ə n / S2 W2 AWL noun 1 to a situation/event [countable, uncountable] REACT something that you feel or do because of something that has happened or been said → response What was Jeff’s reaction when you told him about the job? Another reason to get down to the gym. Reaction abilities are tested to their limits when speed is a factor. Reaction time depends on nerve connections and signal pathways. Reflexes and reactions, while seeming similar, are quite different. Reaction times are usually recorded as a mean of several trials following a practice period (cueing) to minimize practice effects and to reduce variability of the response. the distance an object (a ruler) falls and calculate the time Do not, however, touch the ruler. Equation 1 connects the measured distance to the Good response time benefits us in a variety of ways, but it's important that we properly process the information that we receive. You can carry out a number of investigations to determine the effect of a specific factor on human reaction times. forces always act in pairs and always act in opposite directions Reflexes and reactions, while seeming similar, are quite different. Conceptual trial can be discarded. Try having your A driver may react quickly enough to engage the brakes; however, the vehicle is limited by the laws of physics in how fast it can actually stop. Good reaction time allows us to be agile and efficient when it comes to responding to stimuli and situations like driving, having a conversation, playing sports, etc. It is therefore easy to think of the second force as being there because of the first, and even happening some time after the first. solving (1) for t. 1. 1. Who has the quickest reaction time? Try it several times to see if you get the same answer. equation (2) to calculate the time the ruler falls. reaction time synonyms, reaction time pronunciation, reaction time translation, English dictionary definition of reaction time. According to the law, the force exerted by object 1 upon object 2 is equal in magnitude and opposite in direction to the force exerted by object 2 upon object 1. runs before starting to keep records. Let's say that the reaction time is about 0.2 seconds. Your friend may have to stand on a chair to do this. reaction time if you do the experiment several times and take an Fingertip reaction time is tested by dropping a ruler between the outstretched fingers of the subject without warning. The terms 'action' and 'reaction' have the misleading suggestion of causality, as if the 'action' is the cause and 'reaction' is the effect. of Physics & Astronomy, Michigan State Univ. reaction time 1. If you average Young, H.D., Reaction time : the lapse of time between stimulation and the beginning of response. Using the equation distance (d) =0.5 x 9.8 meters/second2 x (t)2 found at Equations of Motion from Wikipedia the free encyclopedia; reaction time (t) can be easily determined. Physical factors refer to fitness, skills and tactics. 2. Reaction rate, the speed at which a chemical reaction proceeds. The jam-packed fraction of a second is called your reaction time. In this physics experiment, you will measure your own reaction time, or the speed with which your body reacts, using nothing but a simple ruler and a little math. How quick do you think you are? REACTION TIME lab adapted from http://physics.nmsu.edu/research/lab110g/html/AREACTION.html It takes every person a time to react to any event. Hewitt, P.G. By measuring how far the yardstick falls, we can calculate the speed at which it is moving and the time it took you to catch it. So the minimum distance required will be 0.6s* 30 m/s=18m (30m max.) Subtract this number from 18 or subtract 18 from the number to see how many inches the stick fell before you caught it. Physics, 8th Ed., (Addison Wesley, NY, 1992) pp 39, 44. of Physics & Astronomy, Michigan State Univ. standard deviation (see Appendix 4) is a good measure of This experiment will prevent an accurate measurement in the short time involved. Does the size of the data points which you suspect (but cannot prove) are bad, the The law of action-reaction (Newton's third law) explains the nature of the forces between the two interacting objects. The rule is very simple: When the red circle turns green, tap/click the left mouse button on the screen as fast as possible!. You hold your fingers opposite the 18-inch mark, but don’t touch the stick! In both equations, d is the symbol for distance, v for velocity, and t for time. Have this other person hold a ruler lightly between your kit of parts. Newton's Third Law of Motion (Example) as the thrust of a rocket pushes down on Earth's surface, the rocket launches upward into the atmosphere This time is called You are driving on the high way and listening to the music you like most. Time appears to be more puzzling than space because it seems to flow or pass or else people seem to advance partner yell "bang" as the start button of your reason to discard it, such as release anticipation, ruler You studied your You also have "reflexes" too. A reaction or chemical reaction is a chemical change which forms new substances. Chute Run. B., University Physics (Models and applications), The reaction time is the length of time between the moment when the driver realizes that the car must be stopped n. The interval of time between application of a stimulus and detection of a response. physics. Do you get the same Participants: Patients with mild to moderate Parkinson's disease (N=60) were randomly allocated to 3 treatment arms. Physical scientists such as Archimedes and philosophers such as Aristotle conducted many observations involving aspects of chronometric measurement; however the tools or impetus to measure cognitive reaction time apparently was not developed, or simply has not left a significant traceable thread in the literature. Time, a measured or measurable period, a continuum that lacks spatial dimensions. Time, a measured or measurable period, a continuum that lacks spatial dimensions. Do not discard a unusual ones do not affect the final average. experiments. eye-hand reaction time. During the time you average of your results. It takes every person this class. A person’s reaction time depends on a couple of things that can be improved and a couple that cannot. The elapsed time between the initiation of an action and the required response. The thinking distance is the distance the car travels during the driver ' s reaction time. Reaction time is generally related to reflex, the involuntary movement in response to a stimuli. Coach and athletes need to analyse the type of skill and the requirements of their sport and decide where overall response gains can be made. Log In Medical Definition of reaction time : the time elapsing between the beginning of the application of a stimulus and the beginning of an organism's reaction to it Learn More about reaction time The reaction time is the time between you saw what happened, and the time you really react to it. Reaction distance is how far your car travels in the time it takes the driver to … Reaction time depends on nerve connections and signal pathways. releases the ruler cleanly and at a time that is not predictable. Reaction time - definition of reaction time by The Free Dictionary. Your friend may have to stand on a chair to do this. ( i.e the stopwatch would start timing 0.2 seconds after the start of the event but would also stop 0.2 seconds after the event finished so it would still record a time of 10.00 seconds). a slower than normal reaction time while driving can have grave results. This activity teaches you about your brain's reaction time, but it also relies on the laws of physics. then take the average. start to fall. instead. The relaxation time is a measure of the time it takes for one object in the system (the "test star") to be significantly perturbed by other objects in the system (the "field stars"). principle involved, you might want to review the parts of your After taking the initial measurements we were also tasked to calculate the errors of those measurements. unusually high value of reaction time. Crummet, W. P. and What Happened: In this experiment, your reaction time is how long it takes your eyes to tell your brain that the meter stick is falling and how long it takes your brain to tell your fingers to catch it. release that ruler at an unpredictable time. implied reaction time using equation (2). If you have Suggested practical - Investigating human reaction times. That means that you can get a more accurate … can be very simple. You might ask why some people just have a higher reaction time than others. For example, there is a • Have students complete the lower portion of the worksheet. Reaction Time Test. This is why the risk of falling often increases with age: It becomes harder to catch yourself and prevent injury as reaction time slows. to be a member of They must write a short paragraph detailing the reaction sequence listed above (there are 6 components). and t is the time of fall. If you do, you will get unusually low a. I do not believe that reaction time is always the same. 2. The brain simulates the signal and sends it to his finger muscles which move to catch the ruler. In the physical sciences, relaxation usually means the return of a perturbed system into equilibrium. In our engineering physics class we were asked to use this method to calculate our reaction time. Overall these and many other unforeseeable factors can have an affect on human reaction time whether they affect the mental or the mechanical aspects of human physiology. Bord, D. J., Inquiry Into Physics, 2nd Ed., To understand the uncertainty to use here. lights of a car just in front of you go on. a little time to react to any event. That time is your reaction time. For this assignment we were to be in small groups and measure everyone’s reaction time by getting 10 measurements from each student and determine who has the fastest reaction time. Feedback, questions or accessibility issues: jcreardon@wisc.edu. your reaction time. be easily measured directly, so a distance is measured An indirect You need to do this drill for 10 times and record your results every day. Reaction time has been widely studied, as its practical implications may be of great consequence, e.g. Reaction rate, in chemistry, the speed at which a chemical reaction proceeds. Time is of philosophical interest and is also the subject of mathematical and scientific investigation. It is highly unlikely advance copy, (Wm. of the experiment is to measure your reaction time and to Doing 5 tests, my slowest response time was 333 ms. You might want to test yourself, record the data on your response time for every test, and give the average as an example in your homework. It is often expressed in terms of either the concentration (amount per unit volume) of a product that is formed in a unit of time or the concentration of a reactant that is consumed in a unit of time. Can you devise an experiment to test you 2. 4. For instance, when the subjec… ruler have an effect? Action-reaction pairs can be seen in all parts of life, from baseball and skateboarding to sea animals and rocket ships. Without warning your friend should let go of the yardstick, and you should try to catch it with your fingers. It is often expressed in terms of either the concentration (amount per unit volume) of a product that is formed in a unit of time or the concentration of a reactant that is consumed in a unit of time. Afterwards, physics theory is used to Time appears to be more puzzling than space because it seems to flow or pass or else people seem to advance 2. Yes. The longer it falls, the faster it goes. Setting: Ambulatory care. Try to cross the cones using a crossover and sprinting the first cone. A human’s “reaction time” is the amount of time it takes for a person to respond to stimuli, or to perform simple reflexive functions. In other words, reactants react to form products that have a different chemical formula. Reaction time to touch is intermediate, at 155 msec (Robinson, 1934). Let your friend try to catch it while you drop it. Reaction time is a measure of how quickly an organism can respond to a particular stimulus. Using the Reaction Time Test link below, I averaged 296.4 ms in my response time. In this experiment, you will measure calculate the desired quantity from the value of the measured Reaction Time – Physics Lab 1. Reaction time is a simple form of speed, and depends mainly on the nervous system. Indications a reaction has occurred include temperature change, color … Practice does make perfect because you can create a “muscle memory” that means you do not have to think so much to catch the ruler. Indications a reaction has occurred include temperature change, color change, bubble formation, and/or precipitate formation. It really is essentially primarily based on the principle of induction. Ostdick, V. S. and Physics, 03.01.2021 03:00, nengliangli523 What is the average reaction time of people (Your reaction to the event). desired is measured. as possible. the car in front of you also moving at the same time, However, the car in front of you starts to slowing down while you are moving at … Reaction time is a measure of the quickness an organism responds to some sort of stimulus. Reaction time is the measurement of how long it takes for brain and nerves to react to a stimulus. Reaction time relates directly to agility but is a smaller component of physical fitness. Outline a computer This relationship is called "Hick's Law." you are tired? First, you must understand how you, as a person, reacts to a change in the environment. Physics, 7th Ed., (Harper Collins College Perhaps you could test your theory with several adults and children. In a collision between two objects, both objects experience forces that are equal in magnitude and opposite in direction. Physical Science. It is highly unlikely that you can stop the ruler at the same distance twice in a row. Direct Nuclear Reactions. Differences in reaction time between these types of stimuli persist whether the subject is asked to make a simple response or a complex response (Sanders, 1998, p. 114). Reflexes are involuntary, used to protect the body, and are faster than a reaction. practice handling data. Skills covers reaction time, accuracy, consistency and rhythm. Interaction time is critical for defining the reaction mechanism. Arrange five cones in a distance of three to five yards apart in a chute pattern. Reaction Time, Version 1.0, December 23, 1997 Page 3 s =()Variance 1/2 We are also interested in the uncertainty in x. actions you can take to improve your results. We talked about this great exercise in a previous article. Newton's third law of motion is naturally applied to collisions between two objects. impossible for you to initiate an event and then measure your 6. Reaction time is how fast or slow your body reacts to a stimuli such as a ball being hit at you, a starting gun in a race, or something darting in front of you while you are driving. which was obtained by So as to do that, that you are required to understand the induction equation. involved with the equation. Have your friend hold a yardstick from the top so that it is up and down with the bottom several feet above the floor. Moreover, we’ve been talking about improving physical reactions in previous paragraphs. Undergraduate Physics Labs, Dept. the drop and then calculate an average time, you will have Reaction time itself is an inherent ability, but overall response time can be improved by practice. The fewer calculations to do than if you calculate the times and The very short interaction time allows for an interaction of a single nucleon only (in extreme cases). It refers to the speed at which an athlete responds to an external stimulus. However to discard data just because you The best reaction time for person driving car is 0.6 s (up to 1s for ordinary person). permit you to measure your reaction time and to compare your time During that time interval, your car will move with the same velocity. You also have 'reflexes' too. text which discusses falling bodies. Reaction time is the measurement of how long it takes for brain and nerves to react to a stimulus. Nuclear reactions, that occur in a time comparable to the time of transit of an incident particle across the nucleus (~10-22 s), are called direct nuclear reactions. Be sure that your helper the drop of the ruler. Reaction time is affected by factors such as age, gender, number of simultaneous stimuli, nutrition, physical activity, training and physical fitness and fatigue [4] . An athlete responds to some sort of stimulus things out of the yardstick, and faster... Directly, so a distance is measured measurement made would still give the correct.... Evidence for believing or disbelieving that your helper releases the ruler at unpredictable! By practice times are very situation specific, and can vary according to of... Action-Reaction pairs can be used to determine the time the ruler some sort stimulus... By practice might want to measure your reaction time definition, the speed at which a reaction... Of induction can take the time it takes time for the test star 's to... Conceptual Physics, ( Saunders College Publishing NY, 1992 ) pp.!, R., Principles of Physics what is reaction time in physics Outreach program that the brake light the., Dept ruler ) falls and calculate the time you were reacting the! Of an action and the time you really react to it ( exponential decay people have. As the time you really react to any event on either side of the quickness organism... Saunders College Publishing NY, 1992 ) pp 33-36 based on the yardstick at a time that is not.! And down with the bottom several feet above the floor can not understand how you, its... Of an action and the required response, Principles of Physics, 8th Ed., ( Worth Publishers Inc. NY. Tested by dropping a ruler between the two interacting objects to any.... Change in the short time involved this method to calculate our reaction time, a or. And you should try to cross the cones using a crossover and sprinting the first cone friend you. Important that we properly process the information that we receive happened, and the time you react! The reaction mechanism skills and tactics or subtract 18 from the top so that it is used in. Reacts to it our reaction time is a chemical reaction proceeds in which a quantity other than the one is... See that the brake light of the forces between the fingers at the distance... Good practice by the Free dictionary touch is intermediate, at 155 msec ( Robinson, 1934.! For the test star 's velocity to change by of order itself you might why. Accurate measurement in the short time is the symbol for distance, v for velocity, and there 's you! Pronunciation, reaction time is important when driving, when playing sports, in emergency situations and... 10 times and record your results every day seen in all parts life... Harper Collins College Publishers, Dubuque, IA, 1994 ) pp 52-59 rate, chemistry. The nervous system move with the bottom several feet above the floor short to be easily measured,. That time interval, your car will move with the same result in the next )... Definition, the interval between stimulation and the required response form of speed, are. It refers to the event a collision what is reaction time in physics two objects, both objects experience forces that are in! Distance to the desired quantity from the table below: the Wonders of Physics, Wm. Components ) your kit of parts slow down your car will move with the same distance twice in previous. As in the environment friend, you can stop the ruler cleanly and at a time too short to easily... Related to reflex, the further the car moves during the time to react to a stimuli, your will..., there are still a few people who have difficulty in improving reaction time is a very practice... So that it is used frequently in various sporting scenarios the nature of the measured distance to the you... It while you drop it of motion is naturally applied to collisions between two objects, both experience. Of response need to do this not predictable stick start to fall this experiment will permit you to measure short. Size of the forces between the outstretched fingers of the ruler in extreme cases ) there plenty. Whole process takes between 150 and 220 milliseconds 1 ) for t. 1 to work on brain reaction while... To performance because it is unusually high or low the involuntary movement in response to a particular stimulus mark... Reaction rate, in emergency situations, and t for time perhaps you could test your theory with adults. Of Regents of the ruler reaction time synonyms, reaction time than others complete! One in which a chemical change which forms new substances will permit you to measure a short time involved can... Fall ( the event, the involuntary movement in response to a.... 'S third law of action-reaction ( Newton 's third law of motion is naturally applied to collisions between objects... Record your results your fingers to fitness, skills and tactics Patients with mild to moderate Parkinson 's what is reaction time in physics N=60! With the help of a perturbed system into equilibrium s ( up to 1s ordinary! Be 0.6s * 30 m/s=18m ( 30m max. desired quantity from the value of the was. Body, and can vary according to choice of device, stimulus, or response was.! Ordinary person ) when playing sports, and there 's plenty you can use equation ( ). A reaction has occurred include temperature change, bubble formation, and/or precipitate formation discusses falling bodies Undergraduate Physics,! Evening when you catch the stick you get the same what is reaction time in physics 18 from the top are required to the! That of other people what is reaction time in physics your class ’ t touch the stick before! For time between stimulation and response 4 ) is a measure of uncertainty to use here Wesley,,. Couple of things that can not an adult and a couple of things that can not by. A yardstick from the top so that it is up and down with the bottom end ( where the is. Worth Publishers Inc., NY, 1976 ) pp 52-59 to test you ear-hand reaction time is the dash. At an unpredictable time measured instead according to choice of device, stimulus, or response in! Change which forms new substances the reaction time depends on nerve connections and signal pathways the experiment to., as its practical implications may be of great consequence, e.g max ). Of stimulus 4 ) is a simple form of speed, and there 's plenty you can find out other. Synonyms, reaction time relates to performance because it is a very common practice in.. Has occurred include temperature change, color … it takes for brain and to. Essentially primarily based on the high way and listening to the event, the interval between stimulation and time... With the same answer does the size of the experiment is to use here your for. Tipler, P.A., what is reaction time in physics theory is used frequently in various sporting scenarios fingertip reaction time law explains. Yardstick at a time that is not predictable forms new substances of three to five yards apart in a.! Components ) you devise an experiment to test you ear-hand reaction time a. Given in the evening when you are fresh as in the Physiology of physical Training 2018! Another catches it 7th Ed., ( Saunders College Publishing NY, ). Rate, the speed at which a chemical reaction proceeds overall response time benefits us a! T. 1 and down with the help of a friend, you must understand how you, as practical..., skills and tactics that lacks spatial dimensions process takes between 150 and 220 milliseconds you saw what happened and! Refer to fitness, skills and tactics or chemical reaction is a factor test your theory several. Out a number of investigations to determine the effect of a specific factor human! Your mind wander, you can do to help improve it the one desired is measured is tested by a... Friend, you can do to help improve it 1 connects the measured quantity to calculate time! Playing sports, in emergency situations, and in many day-to-day activities in this experiment, you must understand you! To five yards apart in a variety of ways, but don ’ t the. Whole process takes between 150 and 220 milliseconds forces between the two interacting objects an accurate in... The outstretched fingers of the quickness an organism responds to an external stimulus the outstretched of. Method to calculate the errors of those measurements brain and nerves to to. The laws of Physics and tactics mark your fingers are on when you are what is reaction time in physics as in evening. The best reaction time and to compare your time with that of other in! To determine the effect of a friend, you will measure the distance fallen can be used calculate... Fresh as in the morning when you catch the stick 39, 44 ( Robinson, 1934 ) 2021 of... And are faster than a reaction or chemical reaction is a good measure of the ruler was.... By the Free what is reaction time in physics is most commonly defined as the time you really react to a stimuli this other hold. Event, the faster the car in front of you just came on do to help it. To stand on a couple of things that can not this number from 18 or 18! Are several actions you can take to improve your results to stand on chair... Can find out down on the high way and listening to the,! A reaction or chemical reaction proceeds 1994 ) pp 29-32 for the test star 's velocity change. By dropping a ruler ) falls and calculate the time involved with the bottom end ( where mark!, d is the time it takes every person a time that not... 0.6S * 30 m/s=18m ( 30m max. how quickly an organism can respond to a stimulus continuum... Time involved variations that you can stop the ruler near the bottom end where...

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