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Give a specific example of a system with the energy transformation W→U. In this question W is the work done on the system by the environment, and K and U are the kinetic and potential energies of the system, respectively. Any energy not mentioned in the transformation is assumed to remain constant; if work is not mentioned, it is assumed to be zero. Select a specific example of a system with the energy transformation shown.
K→ΔEth

Select a specific example of a system with the energy transformation shown.

A. A wood block sliding across a rough horizontal surface and slowing to a stop.

B. A block sliding on level ground, to which a cord you are holding on to is attached

C. A wood block moving across a horizontal rough surface at constant speed

D. A wood block sliding down a rough inclined surface at a constant speed.

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Answer:

Option A

Explanation:

When a wood block slides across a rough horizontal surface and slows to a stop, kinetic energy is converted to thermal energy because as it moves, the velocity decreases in the motion which results in loss of kinetic energy. From the principles of conservation of energy, the kinetic energy will be converted into thermal energy.