Question

what force causes the ke and the pe to lessen because of a wasting of energy? (in work that we do, we will treat it as negligible.)

□ applied

□ normal

□ friction

rewatch

Explanation:

To determine the force that causes kinetic energy (KE) and potential energy (PE) to decrease due to energy wastage, we analyze each option:

• Applied Force: This force is used to do work on an object, often transferring energy to it, not wasting it to reduce KE/PE.
• Normal Force: It acts perpendicular to surfaces and typically doesn’t cause energy wastage related to reducing KE or PE.
• Friction: Frictional force opposes motion, and work done against friction converts mechanical energy (KE and PE) into heat (a form of wasted energy), thus reducing the overall mechanical energy of the system.

Answer:

C. Friction