About the Exam…

1. About the Exam… • EXAM will begin promptly at11:00 am • Closed book, closed notes • Bring a pencil and calculator • Paper will be provided

2. Study Strategies • Start now! • Do lots (and lots) of practice problems • Study with a class mate • Get enough sleep

3. Test taking strategies • Look through the entire test to see what problems you immediately know how to do and do them first! • Check your numerical answers to see that they do make sense • Make sure your answers include correct units • If you do not know how to do a problem, write down what you do know

4. Chapter 7 - Translational Momentum Translational Momentum Newton’s 2nd Law Impulse-Momentum Theorem Momentum Conservation (1D & 2D) Chapter 8 - Extended Systems Effective Position/Center of Mass (com) System (com) Acceleration com - solid bodies Newton’s 2nd Law Momentum of a System Outline Chapter 9 - Kinetic Energy & Work • Kinetic Energy • Work for constant & variable forces (in 1D, 2D, & 3D) • Net Work-Kinetic Energy Theorem • Work done by a Spring • Work done by Gravity • The Scalar Product • Power

5. Q1 A fly ball to left field is caught at the same height as it was originally hit. Over its entire flight the work done by gravity and the work done by air resistance, respectively, are: • 0; positive • 0; negative • positive; negative • negative; positive • negative; negative

6. Q2 Two marbles, one twice as heavy as the other, are dropped to the ground from the roof of a building. Just before hitting the ground, the heavier marble has: • As much kinetic energy as the lighter one. • Twice as much kinetic energy as the lighter one. • Half as much kinetic energy as the lighter one. • Four times as much kinetic energy as the lighter one. • Impossible to determine

7. Q3 A person holds a 20 N weight two meters above the floor for 30 seconds. The power required to do this is: • 4/3 W • 40 W • 40 h.p. • 120 J-s • None of these

8. Q4 Suppose a ping-pong ball and a bowling ball are rolling toward you. Both have the same momentum, and you exert the same force to stop each. How do the time intervals to stop them compare? • It takes less time to stop the ping-pong ball. • Both take the same time. • It takes more time to stop the ping-pong ball.

9. Q5 Suppose rain falls vertically into an open cart rolling along a straight horizontal track with negligible friction. As a result of the accumulating water, the speed of the cart • increases. • does not change • decreases.

10. Q6 A 75-kg man is riding in a 30-kg cart at 2.0 m/s. He jumps off in such a way as to land on the ground with no horizontal velocity. The resulting change in speed of the cart is: • Zero • 2.0 m/s • 3.0 m/s • 4.0 m/s • 5.0 m/s