Physics 11 Course Review – Sample questions and additional practice Unit 1 – Motion and Forces Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 1. The term "uniform motion" means a. acceleration is constant d. b. speed is constant e. c. velocity is constant displacement is constant velocity is zero ____ 2. An 80.4-km trip takes a time of 0.75 h to complete. The average speed, expressed in the correct manner, is a. 107.2 km/h d. 1 × 102 km/h 2 b. 1.072 × 10 km/h e. 1.1 × 102 km/h c. 29.8 m/s ____ 3. The slope of a position-time graph always represents a. displacement d. change in velocity b. distance e. acceleration c. velocity ____ 4. The area under a velocity-time graph always represents a. displacement d. acceleration b. change in velocity e. change in acceleration c. distance ____ 5. true? a. b. c. d. e. The velocity-time graph pictured below depicts the motion of a motorcycle. Which of the following statements is The motorcycle is always experiencing an acceleration. The motorcycle's greatest speed occurs toward the end of the recorded time interval. The motorcycle's average acceleration is zero. The motorcycle eventually reaches uniform motion. The motorcycle accelerates until it reaches a constant speed. ____ a. b. c. d. e. Consider the following velocity-time graph and select the statement that is true. At no time can the motion be considered "uniform." The object returns to its original position. The object travels in one direction and then the other. The object is accelerating throughout the entire recorded time. The object speeds up and later slows down. ____ a. b. c. 6. 7. A B C Which of the following velocity-time graphs represents the motion of a ball thrown vertically upward? d. e. D E ____ 8. A ball is thrown vertically upward into the air. Which of the following acceleration-time graphs represents the ball's motion? a. b. c. A B C ____ 9. group? a. b. c. A B C d. e. D E Four of the five graphs pictured below could all represent the same motion. Which graph does not belong to this d. e. D E ____ 10. You set out in a canoe from the east shore of a south-flowing river. To maximize your velocity relative to the shore you should point your boat a. north d. south b. east e. southeast c. west ____ 11. A pilot flies to a destination due north from the departure point. During the flight there is a wind blowing from the west. What direction must the pilot point the plane during the flight? a. due east d. due west b. east of north e. west of north c. due north ____ 12. A cyclist rides a bicycle 4.0 km west, then 3.0 km north. What is the cyclist's displacement? a. 7.0 km [37° N of W] d. 5.0 km [37° W of N] b. 7.0 km [37° W of N] e. 1.0 km [37° W of N] c. 5.0 km [37° N of W] ____ 13. A taxi cab drives 2.0 km [W], then 3.0 km [N], then 4.0 km [W], and finally 5.0 km [N]. The entire trip takes 0.30 h. What is the taxi's average velocity? a. 47 km/h [53° W of N] d. 33 km/h [53° W of N] b. 47 km/h [53° N of W] e. 10 km/h [53° W of N] c. 33 km/h [53° N of W] ____ 14. Over a period of 3.0 s a car's velocity changes from 18 m/s [W] to 12 m/s [W]. What is the value of the car's acceleration during this time? a. 2.0 m/s2 [E] d. 10 m/s2 [E] 2 b. 10 m/s [W] e. 2.0 m/s [E] c. 2.0 m/s2 [W] ____ 15. A motorcycle accelerates from rest at 6.0 m/s2. How much farther will it travel during the second 3.0 s of its motion than during the first 3.0 s? a. 98 m d. 27 m b. 81 m e. 15 m c. 54 m ____ 16. An object is thrown vertically upward at 25.0 m/s. If it experiences an acceleration due to gravity of 9.8 m/s2 [down], what is the object's velocity 3.0 s later? a. 22 m/s [down] d. 4 m/s [down] b. 22 m/s [up] e. zero (it has hit the ground) c. 4 m/s [up] ____ 17. A stone is thrown vertically downward with a speed of 10 m/s from a bridge. Accelerating under gravity (9.8 m/s2), the stone strikes the water 1.8 s later. From what height above the water was the stone thrown? (Assume 2 significant digits.) a. 50 m d. 15 m b. 34 m e. 3 m c. 27 m ____ 18. A ball is thrown vertically downward from a window. Accelerating under gravity (9.8 m/s2), the ball hits the ground 2.6 s later with a speed of 20.0 m/s. From what height above the ground was it thrown? a. 85 m d. 19 m b. 39 m e. 10 m c. 29 m ____ 19. Which of the following fundamental forces has the shortest range? a. gravitational d. strong nuclear b. electromagnetic e. They have equal ranges. c. weak nuclear ____ 20. When you place your hand on a desk, the pressure you feel against your hand results from a. the gravitational force b. the strong nuclear force c. the weak nuclear force d. the electromagnetic force e. a combination of the weak and strong nuclear forces ____ 21. A curling stone is pushed along the ice surface during its delivery. Which of the following free-body diagrams best represents the curling stone? a. b. c. A B C d. e. D E ____ 22. An elevator is suspended by a cable and moves upward. Which of the following free-body diagrams best represents the forces acting on the elevator? a. b. c. A B C d. e. D E ____ 23. The free-body diagram below represents a 200-g rock suspended by a string. What is the rock's acceleration? (Assume 2 significant digits.) a. b. c. 6.2 m/s2 [up] 33 m/s2 [down] 0.25 m/s2 [down] d. e. 6.2 x 10–3 m/s2 [up] the rock does not accelerate ____ 24. A car is travelling with uniform motion with a total frictional resistance of 2.8 × 103 N acting in a direction opposite to the motion of the car. What is the force acting on the car in the direction of motion? d. less than 2.8 × 103 N a. much greater than 2.8 × 103 N 3 b. greater than 2.8 × 10 N e. much less than 2.8 × 103 N 3 c. exactly equal to 2.8 × 10 N ____ 25. The free-body diagram shown below depicts the forces acting on an object. If the object is to accelerate to the north, in what direction must an additional force be applied? a. b. c. north northeast northwest d. e. southeast southwest ____ 26. Which of the following observations is explained by Newton's first law? a. kicking your feet against something solid to remove snow from your boots b. feeling as though you're being rocked from side-to-side on a roller coaster c. an apple hanging motionless from the limb of a tree d. feeling as though your head jerks backward when pulling away at green light e. all of the above ____ 27. A heavy crate is pushed across a rough surface. The force that is ultimately responsible for the crate's motion is the a. applied force d. net force b. frictional force e. normal force c. gravitational force ____ 28. A 2.5 × 103 kg car is travelling due west at 30 m/s when the brakes are applied, exerting a force of 5.0 × 103 N [E]. What is the car's acceleration due to the braking? a. 2.0 m/s2 [W] d. 15 m/s2 [E] 2 b. 2.0 m/s [E] e. 2.0 m/s [E] c. 15 m/s2 [W] ____ 29. If the force of gravity that the earth exerts on you is considered to be the action force then, according to Newton's third law, the corresponding reaction force would be the a. normal force of the Earth acting upward on you b. force your feet exert downward on the Earth c. force of gravity you exert on the Earth d. force you exert on your feet, pressing them against the Earth e. force of gravity the Earth exerts on everything else ____ 30. A rocket accelerates upward and the thrust of the engines overcome the frictional forces and the gravity acting against the rocket. Which of Newton's laws of motion best explains this situation? a. Newton's first law b. Newton's second law c. Newton's third law d. Newton's law of universal gravitation e. All the laws combine to explain this situation. ____ 31. Which of the following graphs best represents the relationship between the gravitational force, F, that Earth exerts and the mass, m, of an object sitting at Earth's surface, that the force is exerted upon? a. b. c. A B C d. e. D E ____ 32. Which of the following graphs best depicts the relationship between the gravitational force, F, that two masses exert on one another and the distance, d, which separates their centres of mass? a. b. c. A B C d. e. D E ____ 33. The gravitational field strength of Earth a. has a value of 9.8 N/kg [down] at all locations on its surface b. is greater at the equator than at the poles c. is smallest at the peak of Mount Everest, the highest elevation d. is largest at the deepest spot on the ocean floor e. is largest at the poles ____ 34. 1.6 N/kg? a. 60 kg b. 96 kg c. 98 kg How much would a 60-kg person weigh on the Moon where the gravitational field strength has a magnitude of d. e. 98 N 96 N ____ 35. Your weight on board an orbiting space station would be a. normal d. slightly greater than normal b. only slightly less than normal e. zero c. much less than normal ____ 36. Objects onboard an orbiting space station appear to be "floating" because a. they're falling together b. they're weightless c. they're outside Earth's gravitational pull d. they're in the vacuum of space e. they're in the gravitational field of the Moon ____ 37. If Earth was twice its present mass, but its size was not changed, you would weigh a. half as much d. one-quarter as much b. twice as much e. the same amount c. four times as much ____ 38. Which of the following statements concerning gravitational fields is true? a. Only very massive objects have gravitational fields. b. The gravitational field strength of an object is one-quarter as great at twice the distance from the object's centre. c. The strength of an object's gravitational field is inversely proportional to its mass. d. The strength of an object's gravitational field is inversely proportional to the square of its mass. e. The strength of an object's gravitational field is inversely proportional to the distance from the object's centre. ____ 39. The force of friction always acts in a direction exactly opposite to the a. applied force d. normal force b. net force e. motion c. gravitational force ____ 40. A chalk brush sits on a metre stick as pictured in the diagram. As one end of the metre stick is elevated, the chalk brush eventually begins to slide. Why? a. b. c. d. e. The coefficient of friction changes. The gravitational force on the brush changes. The normal force on the brush changes. The gravitational force begins to act along the metre stick. An applied force is created. Physics Review Motion and Forces - Answer Section MULTIPLE CHOICE 1. ANS: C 21. ANS: E 2. ANS: E 22. ANS: A 3. ANS: C 23. ANS: A 4. ANS: A 24. ANS: C 5. ANS: A 25. ANS: B 6. ANS: E 26. ANS: E 7. ANS: B 27. ANS: D 8. ANS: D 28. ANS: B 9. ANS: C 29. ANS: C 10. ANS: D 30. ANS: B 11. ANS: E 31. ANS: C 12. ANS: C 32. ANS: A 13. ANS: C 33. ANS: E 14. ANS: A 34. ANS: E 15. ANS: C 35. ANS: B 16. ANS: D 36. ANS: A 17. ANS: B 37. ANS: B 18. ANS: D 38. ANS: B 19. ANS: C 39. ANS: E 20. ANS: D 40. ANS: C
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