Question

use the diagram below to answer the question.

diagram: a skateboard with arrows: left arrow labeled b, right arrow labeled a

if a person jumps off of the skateboard in the direction indicated by arrow a, the skateboard will move in the direction of arrow b. which statement below best describes this principle?

• mass can be converted to energy.
• energy is neither created nor destroyed; it only changes form.
• every action force results in an equal and opposite reaction force.
• unless another force is applied, an object in motion will move at a constant speed.

Explanation:

The scenario describes a person pushing off a skateboard (action force in direction A), and the skateboard exerting an equal force back in the opposite direction B. This matches Newton's Third Law of Motion, which states that for every action, there is an equal and opposite reaction.

Answer:

Every action force results in an equal and opposite reaction force.