M02-Free-Fall_rev2 - Physics 123 Minilab 2 FREE FALL Names...

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Physics 123 – Minilab 2 FREE FALL Names _____________________ ________________________ Objective In this week’s lab you will use the ultrasonic ranger to measure the position, velocity, and acceleration of a bouncing ball. (See example 2.7 on p. 55 of your textbook.) Discussion In last week’s lab you found it was rather difficult to produce a constant velocity or acceleration by moving a cart towards or away from the sensor. This week’s lab will explore a situation for which the acceleration is constant: a freely falling object. If air resistance is negligible, a bouncing ball is falling freely when it is not in contact with the floor. Its position y as a function of time is then given by 2 2 1 gt t v y y - = . During free fall the ball’s velocity is given by gt v t v y y - = 0 ) ( , and is thus a linear function of time. Procedure The motion sensor is suspended high above the floor. Drop the ball and let it bounce three times within the range of the sensor. Record this motion with the sensor and the Logger program. It may take several tries to get a good plot of three bounces.
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