Which statment correclty applies to a car that changes its velocity over a period of time?

Question

a. a nonzero net force is acting on it
b. force are acting on it
c. no net force is acting on it
d. the combination of all forces acting on it is zero

Answer 1

The correct statement that applies to a car changing its velocity over a period of time is:

a. a nonzero net force is acting on it.

According to Newton's second law of motion, a change in velocity (which includes acceleration) indicates that there is a net force acting on the object. If a car is changing its velocity, it is either speeding up, slowing down, or changing direction, all of which require a net force. Options b, c, and d would imply that the forces are balanced or that there is no net force, which would not result in a change in velocity.