DEPT. OF PHYSICS&COMPUTER; SIENCES PHY 114:2-50 Instructor Dr. LE. Ekejjuba SPRI

Question

DEPT. OF PHYSICS&COMPUTER; SIENCES PHY 114:2-50 Instructor Dr. LE. Ekejjuba SPRING 2016 EXAM 82 The following formulas may be useful: 1) Newton's 2nd law of motion:- . F m a 3) work Force. displacement Fd 5.) Newton's law of gravity, F 16mm 7) centripetal acceleration, ac v2/r 2.) Linear momentum, p Rate of Workl 6.) 8) Power d2 Take g = 10 m/s. ENCIRCLE the LETTER that corresponds to the correct option. 1. All except one of the following require the application of a net force. Which one is the exce (A Maintaining an object in motion at a constant velocitys Changing an object from a state of rest to a state of motion. C. B. Changing an object's direction of motion without changing the speed. D. Changing an object's speed without changing its direction of motion. E. Maintalning an object in uniform circular motion. A body sliding on a table is observed to gradually slow down. The correct statement is tha slows down because A. No force acts on the body. B. No net force acts on the body C. It is the nature of the body to slow down by itself. 2. D. A net force acts on the body 3. A quantity which is conserved in.the collision of a car and a truck is B. nervous energy A. Momentum of the car C. Total momentum E. Kinetic energy D. momentum of the truck

Explanation / Answer

1-A, 2-D, 3-C options are correct

1-reason....Newton's first law states that an object at rest tends to remain at rest, and an object in motion tends to remain in motion with a constant velocity, unless it is acted on by a nonzero net force.

2- reason- a netforce (frictional force) acts on the body.

3-reason-conservation of total momentum.

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