1. The radius of the path of an object in uniform circular motion is doubled. The centripetal force

needed if its speed remains the same is .

A. Four times as before

B. Half as great as before

C. Twice as much

D. Three times as much

2. Car A has a mass of 1000kg and a speed of 60km/hr. car B has amass of 2000kg and a speed of

30km/hr. compare the kinetic energy foe car A with that of car B.

A. Half as much

B. Four times as much

C. Equal

D. Twice as much

3. What would be the horizontal line in a position-time graph means?

A. Changing position, constant velocity

B. Constant position, constant velocity

C. Changing position, increase velocity

D. Constant position, zero velocity

4. What is the car‟s acceleration if ten seconds after the starting from rest; it is moving at 40m/s?

A. 4.0m/s2

B. 10m/s2

C. 2.5m/s2

D. 0.25m/s2

5. A heavy object and a light object are released from the rest at the same height and time in a

vacuum. As they fall, they have equal .

A. Weights

B. Moments

C. Acceleration

D. Energies

6. Airplanes are designed with pointed nose and thin tails in order to .