PHYSICS FORM 4- CIRCULAR MOTION

1) Is it possible for an object moving with a constant speed to accelerate?

A. No, an object can accelerate only if there is a net force acting on it.

B. No, if the speed is constant then the acceleration is equal to zero.

C. Yes, although the speed is constant, the direction of the velocity can be changing.

D. Yes, if an object is moving it can experience acceleration

2. When an object experiences uniform circular motion, the direction of the acceleration is……………

A. is directed away from the center of the circular path.

B. in the same direction as the velocity vector.

C. is directed toward the center of the circular path.

D. in the opposite direction of the velocity vector.

3. What type of acceleration does an object moving with constant speed in a circular path experience?

A. linear acceleration

B. centripetal acceleration

C. constant acceleration

D. free fall

4. When an object experiences uniform circular motion, the direction of the net force is

A. is directed away from the center of the circular path.

B. is directed toward the center of the circular path.

C. in the same direction as the motion of the object.

D. in the opposite direction of the motion of the object.

5. A car goes around a curve of radius r at a constant speed v. What is the direction of the net force on the car?

A) toward the back of the car

B) toward the curve’s center

C) toward the front of the car

D) away from the curve’s center

6. A car goes around a curve of radius r at a constant speed v. Then it goes around a curve of radius 2r at speed 2v. What is the centripetal force on the car as it goes around the second curve, compared to the first?

A) one-half as big

B) four times as big

C) one-fourth as big

D) twice as big

7. The centripetal force that causes a car to go round a bend in the road is provided by

A. the force produced by the car engine acting on the wheels.

B. the friction between the tyres and the road.

C. the weight of the car.

D. the force exerted by the driver on the steering wheel.

8. The centripetal force F acting on a particle of mass m that is travelling with linear speed v along the arc of a circle of radius r is given by

A. F = v2/mr

B. F = mv2r.

C. F = mr2v.

D. F = mv2/r

9. Consider a particle moving with constant speed such that its acceleration of constant magnitude is always perpendicular to its velocity.

A) It is moving in a parabola.

B) It is moving in a circle.

C) It is moving in a straight line.

D) None of the above is definitely true all of the time.

10. What force is needed to make an object move in a circle?

A) centripetal force

B) weight

C) kinetic friction

D) static friction

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