Gravitational Review

1. Gravitational Review

2. 1. Gravity is continuously applied to an object, causing it to accelerate. After a period of time, however, the object stops accelerating. What conclusion can be drawn? • a. The mass of the object has increased. • b. Gravity on the object has increased. • c. The object reached terminal velocity. • d. The momentum of the object has reached a maximum.

3. 2. Of the following, the greatest gravitational force would occur between • a. a marble and a baseball 5 meters apart. • b. a loaded freighter on the high seas and Earth. • c. the moon and an astronaut standing on the moon. • d. the moon and Earth.

4. 3. Which of the following equations is correctly showing the relationship between mass, weight and gravitational force? • a. w = mg c. w = g/m • b. w = m/g d. w = g + m

5. 4. When gravitational forces and air resistance equalize on an object that is falling toward Earth and the object stops accelerating, what is the velocity of an object called? • a. resultant velocity • c. instantaneous velocity • b. terminal velocity • d. average velocity

6. 5. In the absence of air resistance, how would the acceleration of a 1.5 kg book and the acceleration of a 15 kg rock differ if the objects were dropped from the same height? • a. The book would accelerate twice as fast as the rock. • b. The rock would accelerate twice as fast as the book. • c. The book would accelerate ten times as fast as the rock. • d. They would not differ; they would be the same

7. 6. What happens immediately after a sky diver opens her parachute? • a. Air resistance greatly increases. • b. The sky diver is in free fall. • c. The sky diver’s speed greatly increases. • d. The force of gravity greatly increases.

8. 7. The gravitational force between two objects depends on masses of objects and • a. accelerations of objects. • c. speeds of objects. • b. distance between objects. • d. sizes of objects.

9. 8. Which of the following objects exerts a gravitational force? • a. a bowling ball c. a feather • b. a book d. All of the above

10. 9. Increasing which of these conditions results in more gravitational force between two objects? • a. distance c. mass • b. acceleration d. surface area

11. 10.When an object is in free fall, the only force acting on it is • a. gravity. c. inertia. • b. friction. d. terminal velocity.

12. 11. Free-fall acceleration on the moon • a. depends on an object’s weight. • c. depends on an object’s mass. • b. is the same for all objects. • d. All of the above.

13. 12. Orbital motion is a combination of • a. mass and friction. • c. acceleration and gravity. • b. forward motion and free fall. • d. weight and vertical velocity.

14. 13. Which statement about weight is incorrect? • a. An object weighs more on the moon than it weighs on Earth. • b. A change in an object’s location can change the object’s weight. • c. An object’s weight is directly proportional to its mass. • d. The weight of an object depends on gravity.

15. 14. Astronauts “float” when inside an orbiting spaceship because they are • a. weightless. • c. in free fall. • b. in a vacuum. • d. outside Earth’s gravity.

16. 15. When air resistance balances the weight of a falling object, the velocity • a. slowly decreases. • c. rapidly increases. • b. remains constant. • d. None of the above

17. 16. Weight is best described as • a. an object’s resistance to acceleration. • b. what causes an object to fall. • c. the downward force exerted on an object due to gravity. • d. a force solely dependent on an object’s mass.

18. 17. Which of the following units is used to measure acceleration? • a. m/s • c. m/s2 • b. m ● s • d. m2/s2

19. 18. Which of the following is true? • a. Weight and mass are proportional but not equal. • b. Weight is gravitational force an object experiences due to its mass. • c. The weight of an object on Earth is greater than the weight of the same object on the moon, but the object’s mass stays the same. • d. All of the above

20. 19. Near Earth’s surface, the strongest gravitational force would occur between an elephant and • a. the sun. • c. a cat. • b. the moon. • d. Earth.

21. 20. When an object travels in a circular or nearly circular path around another object, the object is said to be in • a. a circle. • c. orbit. • b. free fall. • d. collision.

22. 21. When completing the Orbital Motion Lab, you found that • a. Objects with larger orbits travel at a faster speed than objects with smaller orbits. • b. Objects with larger orbits travel at a slower speed than objects with smaller orbits. • c. Objects with larger orbits travel the same speed as objects with smaller orbits. • d. None of the above.

23. Gravitational Review

24. 1. Gravity is continuously applied to an object, causing it to accelerate. After a period of time, however, the object stops accelerating. What conclusion can be drawn? • a. The mass of the object has increased. • b. Gravity on the object has increased. • c. The object reached terminal velocity. • d. The momentum of the object has reached a maximum.

25. 2. Of the following, the greatest gravitational force would occur between • a. a marble and a baseball 5 meters apart. • b. a loaded freighter on the high seas and Earth. • c. the moon and an astronaut standing on the moon. • d. the moon and Earth.

26. 3. Which of the following equations is correctly showing the relationship between mass, weight and gravitational force? • a. w = mg c. w = g/m • b. w = m/g d. w = g + m

27. 4. When gravitational forces and air resistance equalize on an object that is falling toward Earth and the object stops accelerating, what is the velocity of an object called? • a. resultant velocity • c. instantaneous velocity • b. terminal velocity • d. average velocity

28. 5. In the absence of air resistance, how would the acceleration of a 1.5 kg book and the acceleration of a 15 kg rock differ if the objects were dropped from the same height? • a. The book would accelerate twice as fast as the rock. • b. The rock would accelerate twice as fast as the book. • c. The book would accelerate ten times as fast as the rock. • d. They would not differ; they would be the same

29. 6. What happens immediately after a sky diver opens her parachute? • a. Air resistance greatly increases. • b. The sky diver is in free fall. • c. The sky diver’s speed greatly increases. • d. The force of gravity greatly increases.

30. 7. The gravitational force between two objects depends on masses of objects and • a. accelerations of objects. • c. speeds of objects. • b. distance between objects. • d. sizes of objects.

31. 8. Which of the following objects exerts a gravitational force? • a. a bowling ball c. a feather • b. a book d. All of the above

32. 9. Increasing which of these conditions results in more gravitational force between two objects? • a. distance c. mass • b. acceleration d. surface area

33. 10.When an object is in free fall, the only force acting on it is • a. gravity. c. inertia. • b. friction. d. terminal velocity.

34. 11. Free-fall acceleration on the moon • a. depends on an object’s weight. • c. depends on an object’s mass. • b. is the same for all objects. • d. All of the above.

35. 12. Orbital motion is a combination of • a. mass and friction. • c. acceleration and gravity. • b. forward motion and free fall. • d. weight and vertical velocity.

36. 13. Which statement about weight is incorrect? • a. An object weighs more on the moon than it weighs on Earth. • b. A change in an object’s location can change the object’s weight. • c. An object’s weight is directly proportional to its mass. • d. The weight of an object depends on gravity.

37. 14. Astronauts “float” when inside an orbiting spaceship because they are • a. weightless. • c. in free fall. • b. in a vacuum. • d. outside Earth’s gravity.

38. 15. When air resistance balances the weight of a falling object, the velocity • a. slowly decreases. • c. rapidly increases. • b. remains constant. • d. None of the above

39. 16. Weight is best described as • a. an object’s resistance to acceleration. • b. what causes an object to fall. • c. the downward force exerted on an object due to gravity. • d. a force solely dependent on an object’s mass.

40. 17. Which of the following units is used to measure acceleration? • a. m/s • c. m/s2 • b. m ● s • d. m2/s2

41. 18. Which of the following is true? • a. Weight and mass are proportional but not equal. • b. Weight is gravitational force an object experiences due to its mass. • c. The weight of an object on Earth is greater than the weight of the same object on the moon, but the object’s mass stays the same. • d. All of the above

42. 19. Near Earth’s surface, the strongest gravitational force would occur between an elephant and • a. the sun. • c. a cat. • b. the moon. • d. Earth.

43. 20. When an object travels in a circular or nearly circular path around another object, the object is said to be in • a. a circle. • c. orbit. • b. free fall. • d. collision.

44. 21. When completing the Orbital Motion Lab, you found that • a. Objects with larger orbits travel at a faster speed than objects with smaller orbits. • b. Objects with larger orbits travel at a slower speed than objects with smaller orbits. • c. Objects with larger orbits travel the same speed as objects with smaller orbits. • d. None of the above.