A highly elastic ball is dropped from a height of 2.8m onto a hard surface. Assu
ID: 1296319 • Letter: A
Question
A highly elastic ball is dropped from a height of 2.8m onto a hard surface. Assume the collision is elastic and no energy is lost to air friction.
Part A
Determine the period of the motion.
Express your answer with the appropriate units.
T = ?
Part B
Is it simple harmonic motion? Why or why not?
No, it is not a simple harmonic motion. In the lowest point the velocity changes its sign nearly instantly, this cannot be described by sine or cosine function.
No, it is not a simple harmonic motion. In the highest point the acceleration is zero, that cannot be described by sine or cosine function.
Yes, it is a simple harmonic motion that can be described by sine or cosine function.
No, it is not a simple harmonic motion. The velocity is constant during this motion, this cannot be described by sine or cosine function.
Explanation / Answer
a) period = 2 * sqrt(2h/g) = 2*sqrt(2*2.8/9.8) = 1.511 sec
b)
it is not simple harmonic as the force is not proporational to deisplacement , it is constant in magnitude
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