Practice_Test_3

# Practice_Test_3 - 1 Practice test 3 1 Which of the...

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1 Practice test 3 1. Which of the following is NOT a definition of kinetic energy of a moving object? a. Kinetic energy is a measure of the force acting on the object b. Kinetic energy is a measure of the work done to put the object in motion. c. Kinetic energy is a measure of the work that needs to be done to bring it to rest. d. Kinetic energy of a moving object is proportional to the square of its speed. 2. If the velocity of an object doubles, its kinetic energy will a. also double b. become three times its initial value c. become four times its initial value d. remain the same. 3. Which of the following statements about kinetic energy is NOT true? a. Kinetic energy is a scalar quantity b. Kinetic energy is a vector quantity c. The kinetic energy of a particle with a negative velocity is a positive quantity d. Kinetic energy can never be negative. 4. Which of the following does NOT represent the work done by a force? a. The dot product of the force vector and the displacement vector b. The product of the force and the displacement in the direction of the force c. The force multiplied by the displacement d. The area under the force versus displacement graph

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2 5. The graph shows the force (F) versus displacement (x). Which of the following is a measure of the work done? a. 48 J b. 16 J c. 36 J d. 32 J F (N ) x (m) 2 4 6 8 2 4 6 6. Which of the following is not a unit of work? a. J s b. J c. N m d. kgm 2 .s -2 7. A force of 50 N is applied at an angle 30 o with the horizontal to a wooden crate to move it along a floor a distance of 10. The work done on the crate is a. 500 J b. 450 J c. 433 J d. 401 J 8. A spring with a spring constant k = 250 Nm -1 is compressed 15 cm. The work done is a. 3.75 J b. 2.8 J c. 5.6 J d. 1.4 J 9. What is the potential energy of the spring in question 8? a. 3.75 J b. 2.8 J c. 5.6 J d. 1.4 J
3 10. The figure shows a 2.0 kg ball suspended from the end of a rope 2.0 m long. What is the gain in potential energy of the ball when the string makes an angle of 30 o with the vertical? a. 5.25 J b. 4.0 J c. 3.88 J d. 3.05 J 2 m 2 kg 30 o 11. If the ball is now released, what will be the kinetic energy of the ball at the bottom of the arc? a. 5.25 J b. 4.0 J c. 3.88 J d. 3.05 J 12. What is the speed of the ball at the bottom of the arc in question 11? a. 4.0 m.s -1 b. 2.5 m.s -1 c. 2.3 m.s -1 d. 2.1 m.s -1 13. In question 10, how much more work needs to be done to raise the ball such that the rope is horizontal? a. 30 J b. 31 J c. 32 J d. 34 J 14. Find A B if A = -3 i + 5 j and B = 4 i – 3 j a. –12 i – 15 j b. –27 c. 27 d. 27 i

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4 15. What is the angle between the two vectors in question 14? a. 158 o b. 143.9 o c. 138 o d. 120 o 16. Which of the following is a definition of conservative force? a.
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## This note was uploaded on 05/01/2011 for the course PHY 2048 taught by Professor George during the Fall '10 term at Edison State College.

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Practice_Test_3 - 1 Practice test 3 1 Which of the...

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