Question

A Teflon-coated box of rocks slides down a rough incline. Which of the following statements is true? The mechanical energy of the block is constant. The kinetic energy of the block is decreasing. The mechanical energy of the block is increasing. The mechanical energy of the block is decreasing. The gravitational potential energy of the block is increasing.

Answer 1

The correct statement is "The kinetic energy of the block is decreasing."

Step-by-step explanation:

As the Teflon-coated box of rocks slides down the rough incline, it experiences friction. Friction leads to a loss of mechanical energy in the system. A decrease in mechanical energy can only be attributed to a decrease in kinetic energy, resulting from the work done by the friction force.

The correct statement is "The kinetic energy of the block is decreasing."