Question

what force is responsible for the decrease in the mechanical energy of the block?
options: tension, gravity, friction, normal force
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Explanation:

Mechanical energy is the sum of kinetic and potential energy. Friction is a non - conservative force that does work on the block, converting mechanical energy into thermal energy, thus decreasing the mechanical energy of the block. Tension, gravity, and normal force are either conservative forces (gravity) or forces that do not dissipate mechanical energy (tension, normal force) in the context of energy loss from the block's mechanical energy.

Answer:

C. friction