1. In studying the behavior of bouncing balls, a couple of Science 10 students recorded the
following energy values.
Bouncing Balls
Type of Ball
Starting Potential Energy (J) Ending Potential Energy (J)
golf ball
0.44
0.38
tennis ball
0.56
0.30
Use these energy values to compare the percent efficiencies of the balls during the bounce.
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Ответ:
a) Yes because spiderman isn’t part of the system (the train), so he exerts an external force on the system, causing it to slow. The sign is negative because the train is slowing negative.
b) The train was initially moving, so it had kinetic energy, the energy of movement. There isn’t the same amount anymore because spiderman did work onto the train. Work is defined by the change of kinetic energy of the system, so the train didn’t have the same amount of that type of energy at the end.
I hope this helps! :)