Bouncing ball, height

The orbital size of an atomic electron (top) is correlated with its orbital energy, just as the bounce height of a tennis ball is correlated with its kinetic energy (bottom). 

Find two rubber balls that bounce to about the same height. Put one ball in the freezer section of a refrigerator. Leave the other ball out in the room. Wait about four hours. 

Drop each ball from a height of 1 m, and measure its bounce. Perform three trials for each ball, and record the values in your data table. 

Organizing data Calculate the average height of the bounce for each type of ball. 

A crosslinked polybutadiene ball of mass 100 g is dropped at 300 K from a height of 1 m and bounces back 92 cm. 

In some instances the ball is dropped by allowing it to roll off an inclined track and is, therefore, rotating when it hits the sample. In the case of a no-fire, the ball bounces away from the block and only impacts the sample once, thus overcoming one of the inherent problems of multiple impacts produced by drop hammers. In other cases the ball is retained at the drop height and is released electromagnetically. The ease of sample testing, the low cost of the expendable... 

Figure 8.6 Simplified definition of E and E" (22). When a viscoelastic ball is dropped onto a perfectly elastic floor, it bounces back to a height E, a measure of the energy stored elastically during the collision between the ball and the floor. The quantity E" represents the energy lost as heat during the collision.

A rubber ball is dropped from a height of 1 yard and bounces back 18 in. Assuming a perfectly elastic floor, approximately how much did the ball heat up The heat capacity, Q, of SBR rubber is about 1.83 kJ kg" -K ... 

The Rebound Test, a test easily adapted to measurements over wide temperature ranges whereby a ball is bounced on the sample surface and the height of the rebound is taken as a measure of hardness. (Shore s name is sometimes associated with this measure of hardness.)... 

A ball dropped onto a stone floor will continue bouncing until its kinetic energy has been dispersed. The original energy is transferred to the molecules of the ball and to those of its area of contact with the floor, which will slowly heat up (this is more easily seen in a squash ball after a few minutes play) thus increasing the random movement of both the molecules within the floor and the molecules within the ball. To reverse the process and push the ball back to the height at which it... 

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