1. < BackNext >PreviewMain Forces and Motion Preview Chapter 6 CRCT Preparation

2. < BackNext >PreviewMain Chapter 6 CRCT Preparation 1.The table shows the accelerations produced when different forces act on a 5 kg mass. Assuming that the pattern in the table continues, use these data to predict what the acceleration would be when a 100 N force acts on a 5 kg mass. A10 m/s 2 B100 m/s 2 C20 m/s 2 D30 m/s 2

3. < BackNext >PreviewMain Chapter 6 CRCT Preparation 1.The table shows the accelerations produced when different forces act on a 5 kg mass. Assuming that the pattern in the table continues, use these data to predict what the acceleration would be when a 100 N force acts on a 5 kg mass. A10 m/s 2 B100 m/s 2 C20 m/s 2 D30 m/s 2

4. < BackNext >PreviewMain Chapter 6 CRCT Preparation 2.Friction acting on a rolling ball to eventually bring the ball to a stop is an example of which of the following? Aan unbalanced force Bgravity Ca balanced force Dmomentum

5. < BackNext >PreviewMain Chapter 6 CRCT Preparation 2.Friction acting on a rolling ball to eventually bring the ball to a stop is an example of which of the following? Aan unbalanced force Bgravity Ca balanced force Dmomentum

6. < BackNext >PreviewMain 3.A short time after jumping from an airplane, a skydiver reaches a constant speed. Which of the following statements about the skydiver is true? A The skydiver is accelerating toward the ground at 9.8 m/s 2. BAn unbalanced force acts on the skydiver. CNo unbalanced forces act on the skydiver. DAir resistance does not affect the skydiver’s speed. Chapter 6 CRCT Preparation

7. < BackNext >PreviewMain Chapter 6 CRCT Preparation 3.A short time after jumping from an airplane, a skydiver reaches a constant speed. Which of the following statements about the skydiver is true? A The skydiver is accelerating toward the ground at 9.8 m/s 2. BAn unbalanced force acts on the skydiver. CNo unbalanced forces act on the skydiver. DAir resistance does not affect the skydiver’s speed.

8. < BackNext >PreviewMain 4.Two objects in motion have different masses. How does the difference in mass affect the forces needed to make the objects achieve the same rate of change of velocity? AThe object that has less mass will require more force to achieve the same rate of change. BForce does not affect the rate of change of an object. CIt will take the same amount of force to achieve the same rate of change for the two objects. DThe object that has greater mass will require more force to achieve the same rate of change. Chapter 6 CRCT Preparation

9. < BackNext >PreviewMain Chapter 6 CRCT Preparation 4.Two objects in motion have different masses. How does the difference in mass affect the forces needed to make the objects achieve the same rate of change of velocity? AThe object that has less mass will require more force to achieve the same rate of change. BForce does not affect the rate of change of an object. CIt will take the same amount of force to achieve the same rate of change for the two objects. DThe object that has greater mass will require more force to achieve the same rate of change.

10. < BackNext >PreviewMain 5.The equation represents Newton’s second law of motion. Based on this equation, if balanced forces act on an object, which of the following outcomes can be expected? AThe object’s acceleration will be negative. BThe object’s acceleration will be zero. CThe object’s mass will decrease. DThe object’s mass will increase. Chapter 6 CRCT Preparation

11. < BackNext >PreviewMain Chapter 6 CRCT Preparation 5.The equation represents Newton’s second law of motion. Based on this equation, if balanced forces act on an object, which of the following outcomes can be expected? AThe object’s acceleration will be negative. BThe object’s acceleration will be zero. CThe object’s mass will decrease. DThe object’s mass will increase.

12. < BackNext >PreviewMain Chapter 6 CRCT Preparation 6.Analyze the equation. If the mass of an object decreases while a constant force is applied to the object, what happens to the object’s acceleration? AThe object’s acceleration will increase. BThe object’s acceleration will decrease. CThe object’s acceleration remains unchanged. DThe object’s acceleration is zero.

13. < BackNext >PreviewMain Chapter 6 CRCT Preparation 6.Analyze the equation. If the mass of an object decreases while a constant force is applied to the object, what happens to the object’s acceleration? AThe object’s acceleration will increase. BThe object’s acceleration will decrease. CThe object’s acceleration remains unchanged. DThe object’s acceleration is zero.

14. < BackNext >PreviewMain 7.The illustration summarizes the results of an experiment that involves dropping a feather and a rock at the same time in a vacuum chamber. Which of the following is a true statement? Chapter 6 CRCT Preparation A The rock and the feather are accelerating at the same rate. B The rock and the feather are subject to air resistance. C The rock and the feather are moving with constant speed. D The rock and the feather reach the ground at different times.

15. < BackNext >PreviewMain 7.The illustration summarizes the results of an experiment that involves dropping a feather and a rock at the same time in a vacuum chamber. Which of the following is a true statement? Chapter 6 CRCT Preparation A The rock and the feather are accelerating at the same rate. B The rock and the feather are subject to air resistance. C The rock and the feather are moving with constant speed. D The rock and the feather reach the ground at different times.

16. < BackNext >PreviewMain 8.Analyze the illustration. Given that acceleration is the rate at which velocity changes, what is the rate of acceleration of the rock? A0 m/s 2 B9.8 m/s 2 C14.7 m/s 2 D19.6 m/s 2 Chapter 6 CRCT Preparation

17. < BackNext >PreviewMain Chapter 6 CRCT Preparation 8.Analyze the illustration. Given that acceleration is the rate at which velocity changes, what is the rate of acceleration of the rock? A0 m/s 2 B9.8 m/s 2 C14.7 m/s 2 D19.6 m/s 2

18. < BackNext >PreviewMain Chapter 6 CRCT Preparation 9.What does the magnitude of the gravitational force between two bodies depend on? Athe velocity of the bodies and the friction between them Bthe size of the bodies and their position relative to Earth Cthe weight of the bodies and how quickly they are moving Dthe mass of the bodies and the distance between them

19. < BackNext >PreviewMain Chapter 6 CRCT Preparation 9.What does the magnitude of the gravitational force between two bodies depend on? Athe velocity of the bodies and the friction between them Bthe size of the bodies and their position relative to Earth Cthe weight of the bodies and how quickly they are moving Dthe mass of the bodies and the distance between them

20. < BackNext >PreviewMain 10. An object moving in a straight line with a constant speed has no unbalanced forces acting on it. How will the object’s motion change over time? AThe object will gradually slow down and come to a stop. BCentripetal force will cause the object to go into a circular orbit. CThe object’s motion will remain unchanged. DThe object will accelerate and change direction. Chapter 6 CRCT Preparation

21. < BackNext >PreviewMain Chapter 6 CRCT Preparation 10. An object moving in a straight line with a constant speed has no unbalanced forces acting on it. How will the object’s motion change over time? AThe object will gradually slow down and come to a stop. BCentripetal force will cause the object to go into a circular orbit. CThe object’s motion will remain unchanged. DThe object will accelerate and change direction.

22. < BackNext >PreviewMain Chapter 6 CRCT Preparation 11. In archery, you use a bow to shoot an arrow at a target. Why must an archer point the arrow a little above the target in order to hit the target in the center? What forces are involved?

23. < BackNext >PreviewMain 11. Answer - Full credit answers should include the following points: The arrow moves in a curved path according to projectile motion. The arrow’s horizontal velocity is constant if you ignore air resistance. The arrow’s vertical velocity increases because gravity causes it to accelerate downward. The archer must aim slightly upwards of the target in order to compensate for acceleration due to gravity. Chapter 6 CRCT Preparation

24. < BackNext >PreviewMain 12. Luging is a sport in which a racer slides down an ice-covered track. Identify the three main forces acting on the racer and describe whether each one acts to increase or to decrease the racer’s speed. Chapter 6 CRCT Preparation

25. < BackNext >PreviewMain 12. Answer - Full credit answers should include the following points: Gravity increases the racer’s speed. Drag, or air resistance, decreases the racer’s speed. Kinetic friction (between the luge and the ice) decreases the racer’s speed. Chapter 6 CRCT Preparation