The ball transfers enough momentum into the board to knock it over, and still has enough momentum after the collision to bounce nearly to its original height. ![]() Most of the its momentum is transferred back into the ball and board. In this case, the total kinetic energy after the collision is shared between the ball and the board, as some of the initial kinetic energy was transferred to the board during the collision. It knocks over the board and still bounces back close to its original height, indicating that a small amount of kinetic energy is lost to deformation.įor the elastic ball, the total kinetic energy immediately after the collision is equivalent to the kinetic energies of the ball and board after the collision minus the energy lost due to deformation: The elastic ball does not deform as much and loses less kinetic energy, transferring more kinetic energy and momentum to the board than the inelastic ball does. The momentum leftover after transferring to the board and deforming the ball is not enough to push the ball back to its original height, so the ball will barely bounce off of the board, if at all. Most of the momentum is transferred back into the ball, deforming it. In addition, because some kinetic energy is lost, there is less kinetic energy in the system to transform into potential energy, and the ball cannot reach its original height.ĭuring collision the ball does not transfer enough momentum into the board to knock it over. Let’s look at the kinetic energy and momentum for the two balls.įor the inelastic ball, the total kinetic energy immediately after the collision is equivalent to the kinetic energy of the ball after the collision minus the energy lost due to friction: For this reason, the potential energies cancel out. The potential energy immediately before and after the collision for both balls are the same. We can see this directly by noticing that the inelastic ball does not knock over the board and also does not bounce back to its original height, indicating that a significant amount of kinetic energy is lost to deforming the ball. The energy goes into deforming the ball.” When force is applied, the molecules in the ball slide past one another. This is because there are no cross-links between the butyl rubber. The energy that makes the bounce ball bounce again is absorbed by butyl rubber, so it ‘dies’ almost immediately. It acts just like the bouncing ball, except it absorbs more of the energy. The process repeats itself until the ball has no more energy and comes to a stop. The upward energy created when it returns to its normal shape causes the entire ball to bounce upward again. When it makes contact with the ground, the ball flattens momentarily before bouncing back to its original shape. This prevents the molecules of rubber to slide past each other when a force is applied to the ball. The natural rubber polymer’s molecules are crossed linked by another substance. The ball that bounces is made of a natural rubber. “Though they look the same, each ball is made of a different material. While both of these collisions are partially inelastic, the inelastic ball loses more kinetic energy while colliding with the board than the elastic ball does. This means that some kinetic energy is lost during these collisions, or rather, that kinetic energy is not conserved. The collisions between the inelastic and elastic balls and the board are partially inelastic collisions. u = speed of the board just after collision. ![]()
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