Questions: If friction cannot be ignored, the mechanical energy of a moving object will -?- A) increase B) remain constant C) decrease D) increase or decrease, depending on th mass

Solution Steps

Friction is a force that opposes the motion of an object. When friction is present, it does work on the moving object, converting some of its mechanical energy into thermal energy.

Since friction converts mechanical energy into thermal energy, the total mechanical energy (sum of kinetic and potential energy) of the object will decrease over time.

Given that friction causes a loss in mechanical energy, the correct answer is: C) decrease

Final Answer