WORK, POWER AND ENERGY TEST QUESTIONS

Directions. Choose the letter of the best answer.

1.  What is the energy of a motorcycle moving slowly at the top of a hill?

A. entirely kinetic

          B. entirely potential  

          C. entirely gravitational

D. both kinetic and potential

2. Which event is explained in the sequence of energy changes shown in the diagram below?

A. a headlight is on     

B. a turbine spins

C. electric current powers a flat iron

D. gasoline burns to run a jeepney

3. In the Agus VI Hydroelectric Power (HEP) Plant, which energy transformation takes place?

A. electrical energy à mechanical energy à electrical energy.

B. gravitational potential energy à  kinetic energy à electrical energy

          C. heat à mechanical energy à electrical energy.

D. nuclear energy à heat à electrical energy

4.   Which  event  does  NOT  describe  potential  energy  being  changed  into  kinetic energy?

A. A box sliding down a ramp.

B. A mango falling from a crate.

C. A pen spring being compressed.

D. A stretched rubber band got loosened.

5. Which event illustrates the direct transformation of potential to kinetic energy?

A.  A basketball player catches a flying ball.

B.  A Kalesa moves from rest.

C.  Kathy’sarrow is released from its bow.

D.  The spring mechanism of a toy is rotated until it locked.

6. Which sequence of energy transformation best describes what happens when you switch on your battery-run radio?

A. Mechanical Energy à Electrical Energy  à Sound Energy 

B. Mechanical Energy à Chemical Energy  à Sound Energy

C. Chemical Energy  à Electrical Energy  à Sound Energy 

D. Chemical Energy  à Mechanical Energy à Sound Energy

7. Which among the forms of energy is considered a potential energy?

          A. chemical energy

B. radiant energy

C. sound energy

D. thermal energy

8. Which of the following happens to a coconut that falls freely?

          A. Loses potential energy and gains kinetic energy.

          B. Loses both potential energy and kinetic energy.

          C. Gains potential energy and loses kinetic energy.

          D. Gains both potential energy and kinetic energy.

9.  A torchlight fell from a watch tower. The potential energy of the torchlight at the highest point compared to its kinetic energy at the lowest point is _______

A. lesser. 

B. equal.

C. greater.    

D. not related.

10. The potential energy of a 1-kg object on top of a hill is 18 J. What is its velocity in m/s just before it hits the bottom of the hill?

A. 36 

B. 18

C. 6    

D. 3

11. The total mechanical energy of a swinging bungee jumper

A. is equally divided between kinetic energy and potential energy.

B. at any one instant, is either all kinetic energy or all potential energy.

C. can never be negative.

D. is constant, if only conservative forces act.

12. A bag drops some distance and gains  90J of kinetic energy. Considering air resistance, how much gravitational potential energy did the bag lose?

A. more than 90 J  

B. exactly 90 J

C. less than 90 J 

D. cannot be determined from the information given

13. The wind-up toy that is fully wound and at rest possesses

A. kinetic but no potential energy

B. potential but no kinetic energy

C. both potential and kinetic energy in equal amounts

D. neither potential nor kinetic energy

14. In which case is there a decrease in gravitational potential energy?

A. Amada stretches horizontally a rubber band.

B. A car ascends a steep parking ramp.

          C. Pamela’s puppy jumps down the chair.

          D. Water is forced upward through a pipe.

15. A picture frame falls off the wall. Considering the presence of air, how does the kinetic energy (K) just before striking the floor compare to the potential energy (P) at its hanging point?

          A. K is equal to P.

          B. K is greater than P.

          C. K is less than P.

D. It is impossible to tell.

16. A runner jumps over a hurdle. Neglecting friction, the potential energy of the  runner at the highest point compared to his kinetic energy at the lowest point is _____

A. lesser. 

B. equal.

C. greater.    

D. not related.

17. The potential energy of a 4-kg object on top of a hill is 72J. What is its velocity in m/s just before it hits the ground?

A. 36 

B. 18

C. 6    

D. 3

18. The total mechanical energy of a yoyo

A. is equally divided between kinetic energy and potential energy.

B. at any one instant, is either all kinetic energy or all potential energy.

C. can never be negative.

D. is constant, if only conservative forces act.

19. A stone rolls down some distance and gains 45J of kinetic energy. Considering air resistance, how much gravitational potential energy did the bag lose?

A. more than 45 J  

B. exactly 45J

C. less than 45 J

D. cannot be determined from the information given

20. A fully spring-wound toy fan that is about to rotate possesses

A. kinetic but no potential energy

B. potential but no kinetic energy

C. both potential and kinetic energy in equal amounts

D. neither potential nor kinetic energy

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