SAT Physics Practice Test: Work, Energy, and Power

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Question 11 questions

Time 9 minutes

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1. A force F of strength 20 N acts on an object of mass 3 kg as it moves a distance of 4 m. If F is perpendicular to the 4 m displacement, the work it does is equal to

A. 0 J
B. 60 J
C. 80 J
D. 600 J
E. 2,400 J

2. Under the influence of a force, an object of mass 4 kg accelerates from 3 m/s to 6 m/s in 8 s. How much work was done on the object during this time?

A. 27 J
B. 54 J
C. 72 J
D. 96 J
E. Cannot be determined from the information given

3. A box of mass m slides down a frictionless inclined plane of length L and vertical height h. What is the change in its gravitational potential energy?

A. –mgL
B. –mgh
C. –mgL/h
D. –mgh/L
E. –mghL

4. An object of mass m is traveling at constant speed v in a circular path of radius r. How much work is done by the centripetal force during one half of a revolution?

A. πmv2
B. 2πmv2
C. 0
D. πmv2r
E. 2πmv2r

5. While a person lifts a book of mass 2 kg from the floor to a tabletop, 1.5 m above the floor, how much work does the gravitational force do on the book?

A. –30 J
B. –15 J
C. 0 J
D. 15 J
E. 30 J

6. A block of mass 3 kg slides down a frictionless inclined plane of length 6 m and height 4 m. If the block is released from rest at the top of the incline, what is its speed at the bottom?

A. 5 m/s
B. 6 m/s
C. 8 m/s
D. 9 m/s
E. 10 m/s

7. A block of mass 3 kg slides down an inclined plane of length 6 m and height 4 m. If the force of friction on the block is a constant 16 N as it slides from rest at the top of the incline, what is its speed at the bottom?

A. 2 m/s
B. 3 m/s
C. 4 m/s
D. 5 m/s
E. 6 m/s

8. As a rock of mass 4 kg drops from the edge of a 40-meter-high cliff, it experiences air resistance, whose average strength during the descent is 20 N. At what speed will the rock hit the ground?

A. 8 m/s
B. 10 m/s
C. 12 m/s
D. 16 m/s
E. 20 m/s

9. An astronaut drops a rock from the top of a crater on the moon. When the rock is halfway down to the bottom of the crater, its speed is what fraction of its final impact speed?

A.
B. 1/4
C.
D. 1/2
E.

10. A force of 200 N is required to keep an object sliding at a constant speed of 2 m/s across a rough floor. How much power is being expended to maintain this motion?

A. 50 W
B. 100 W
C. 200 W
D. 400 W
E. Cannot be determined from the information given

11. The moon has mass M and radius R. A small object is dropped from a distance of 3R from the moon’s center. The object’s impact speed when it strikes the surface of the moon is equal to for k =

A.
B.
C.
D.
E.