Question

when an object has its motion changed, the cause is generally __________. a. an external force b. an internal force c. an existential force d. an interval force please select the best answer from the choices provided.

Explanation:

According to Newton's first - law of motion, an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced external force. So, a change in an object's motion is generally caused by an external force.

Answer:

A. an external force