6. All except one of the following require the application of a net force. Which

Question

6. All except one of the following require the application of a net force. Which one is the exception?

A. to change an object's speed without changing its direction of motion

B. to change an object's direction of motion without changing its speed    

C. to maintain an object in motion at a constant velocity

D. to maintain an object in uniform circular motion

E. to change an object from a state of rest to a state of motion

______________________________________________________________________________________

7. A heavy ball with a mass of 7.0 kg is observed to accelerate at a rate of 3.0 m/s2. What is the size of the net force acting on this ball?

__________ N

8. The starship Enterprise locks onto an alien ship (whose mass is much greater than the Enterprise's mass) with its tractor beam (think of this as a futuristic rope) and starts to pull the alien ship toward it. Neither ship has its propulsion engines running. Which ship has greater acceleration towards the other?

A. the Enterprise

B. Neither ship can move because there is no friction in outer space.    

C. They both move with equal acceleration.

D. the alien ship

________________________________________________________________________

9. The force that accelerates a car on a level road is exerted by which object?

A. Gears

B. Drive shaft    

C. The road

D. Rear axle

E. Motor

____________________________________________________________________

10. A car rounds a curve while maintaining constant speed. The correct statement is:

A. The velocity of the car is zero.

B. A net force acts upon the car.    

C. No net force acts on the car.

D. The velocity of the car is constant.

E. The acceleration of the car is zero.

Explanation / Answer

6,. B

7. 21 N

8. B

9. A

10. B

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