It is your turn to keep the younger members of the family amused for half an hourwhile everyone else...

Question

It is your turn to keep the younger members of the family amused for half an hourwhile everyone else prepares the evening meal so you wander outside of the houseonto the concrete driveway, taking a tennis ball and a ping-pong ball with you.a) You hold both of the balls out in front of you at the same height and let go ofthem at the same time. They bounce off the concrete. Which bounces higher andwhy?b) You now place the ping-pong ball on top of the tennis ball and drop them inthis arrangement from the same height as you did previously. When the tennis ballhits the ground the ping-pong ball shoots off the top high into the air, to the delight ofthe younger children. Why did the ping pong ball do this and how high did it go?

Robert · Accepted Answer

Question 1: 
It is your turn to keep the younger members of the family amused for half an hour 
while everyone else prepares the evening meal so you wander outside of the house 
onto the concrete driveway, taking a tennis ball and a ping-pong ball with you. 
a) You hold both of the balls out in front of you at the same height and let go of 
them at the same time. They bounce off the concrete. Which bounces higher and 
why? 
Tennis ball which is heavier .Ping-pong ball will rise higher as it is small and will have 
higher Cr value. 
Coefficient of restitution=CR 
 
 
b) You now place the ping-pong ball on top of the tennis ball and drop them in 
this arrangement from the same height as you did previously. When the tennis ball 
hits the ground the ping-pong ball shoots off the top high into the air, to the delight of 
the younger children. Why did the ping pong ball do this and how high did it go?
This is because of low coefficient of restitution value. As well as the ping pong ball is small 
so loss of energy due to friction is less.
Question 2: 
POWER  
How powerful are you? 
a. Make an order of magnitude calculation of your power output as you climbstairs. 
State all of your assumptions.
As we climb stairs power output is mgh where 
m=mass of the man 
g=acceleration due to gravity 
h=height travelled
Assumptions done: 
No energy is lost due to chemical energy, frictional energy. 
b.

It is your turn to keep the younger members of the family amused for half an hourwhile everyone else prepares the evening meal so you wander outside of the houseonto the concrete driveway, taking a...

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