Understanding Energy Loss to Heat and Friction in Bouncing Objects

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When a ball is dropped on a table, it does not bounce back to the same height due to energy loss primarily as heat, which increases the internal energy of the ball. This energy loss is not caused by friction between the ball and the table, as there is no significant rubbing during the collision. Instead, internal friction within the ball's material contributes to the energy dissipation. Additionally, air resistance plays a role in reducing the ball's bounce height. Overall, both internal friction and air resistance are key factors in the energy loss observed in bouncing objects.
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If a ball is dropped on a table it doesn't bounce back at the same height. Is this because some energy is lost to heat? If so, is this an example of friction, or is friction only when objects are being rubbed together?
 
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Yes, mechanical energy is lost as heat (to increase internal energy).
It's not due to friction between the ball and the table (which doesn't really rub in this collision)...
but there is internal friction between the bits of material that make up the ball.
 
In addition, energy is lost to air resistance.
 

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