Question

test on module 5 circular motion. show all your work

1. which describes an object in uniform circular motion?

a. it accelerates because its velocity is toward the center of a circle.
b. it does not accelerate because the force acting on it constantly changes magnitude.
c. it accelerates because it constantly changes direction. d. it does not accelerate because it travels at a constant speed.

1. which describes the centripetal acceleration of an object in uniform circular motion?

a. it constantly changes direction but always points away from the center. b. it constantly changes direction but always points tangent to the circle.
c. it constantly changes direction but always points toward the center. d. it constantly changes magnitude but always points tangent to the circle

1. which describes centrifugal “force”?

a. it exists and acts toward the center.
b. it exists and acts away from the center.
c it is fictitious even though there is an agent. d. it is fictitious because there is no agent

1. which describes

Explanation:

1. Uniform circular motion has constant speed but changing direction (velocity is vector), so acceleration occurs due to direction change.
2. Centripetal acceleration always points toward the center to maintain circular motion, with direction changing as the object moves.
3. Centrifugal "force" is a fictitious (inertial) force observed in rotating frames, not a real force with an agent.

Answer:

1. C. It accelerates because it constantly changes direction.
2. C. It constantly changes direction but always points toward the center.
3. D. It is fictitious because there is no agent.