The remaining questions, #7-16, have only one correct response. Select the best answer for each. 7. As a steel ball falls in a place with no atmosphere (no 12. A hockey puck is on a friction-negligible ice surface. A air), consider one force to be the pull on the ball by the player then hits the puck. Which of the following best earth. What is the pair to this force? describes the puck's motion after the puck has been hit? a. Air resistance acting against the ball. b. The pull on the earth by the ball. a. The puck is speeding up c. The kinetic frictional force on the earth The puck is motionless d. None of these. C . The puck is slowing down d. The puck is moving at a constant velocity 8. A horse exerts a 500 N force on a heavy wagon, causing it to increase its speed. What force does the wagon 13. A 2.0 kg block is sliding at a constant velocity and exert on the horse? encounters a frictional force of 4 N. What force is a. Less than 500 N. necessary to keep the block sliding at that velocity? b. 500 N. a. ON C. More than 500 N. b. AN It's not possible to tell. C. 8 N d. 196N 9. Which of Newton's Laws could you use to justify your 14. In the problem above, we now turn off friction. What answer to the previous two questions? force is necessary to keep the puck sliding at a constant a. Newton's Ist Law of Inertia velocity? b. Newton's 2nd Law of Motion 3. ON c. Newton's 3rd Law of Reactions b. 4N d. None of these C. 8N d. 19.6 N 10. A car drives at constant velocity. Which of the 15. Which of the following scenarios would describe an following best describes this situation? object in mechanical equilibrium? a. The forces are balanced in all directions a. A bowling ball sliding on a carpeted surface b. The forces are unbalanced in all directions b. A train that is slowing to a stop C . The forces are unbalanced in the y-direction; c. A car in cruise control on the highway moring balanced in the x-direction at a constant velocity The forces are balanced in the y-direction; d. A ball thrown straight up in the air unbalanced in the x-direction 16. A bus is driving down the road. A bug flies in front of it 11. A ball is thrown straight up and is in the air. Which of and splatters on the windshield Which of the following the following best describes this situation? statements is true? a. The forces are balanced in all directions a. The force the bug exerts on the bus is greater than b The forces are unbalanced in all directions the force the bus exerts on the bug- C. The forces are unbalanced in the y-direction; The force the bus exerts on the bug is greater than balanced in the x-direction the force the bug exerts on the bus. The forces are balanced in the y-direction; The force the bug exerts on the bus is equal to the unbalanced in the x-direction force the bus exerts on the bug.We There are no forces in play here
