Question

d. state what happens to the internal energy of the crate as it slides along the incline.

Explanation:

When a crate slides along an incline, there is friction between the crate and the incline surface. Friction does work on the crate, converting mechanical energy (kinetic and potential) into internal energy (related to the thermal energy of the crate and the incline due to molecular motion). As the crate slides, the frictional force causes energy dissipation in the form of heat, which increases the internal energy of the crate (and also the incline, but the question focuses on the crate). So, the internal energy of the crate increases because of the work done by friction, which is a non - conservative force that converts mechanical energy to internal energy.

Answer:

The internal energy of the crate increases as it slides along the incline. This is because friction between the crate and the incline does work on the crate, converting mechanical energy into internal energy (thermal energy) due to the molecular motion within the crate being increased.