Name: ________________________ Class: ___________________ Date: __________
Projectile Motion Question Set Multiple Choice Identify the choice that best completes the statement or answers the question. ____
____
____
____
____
1. Which of the following is an example of projectile motion? a. a jet lifting off a runway b. a thrown baseball c. an aluminum can dropped straight down into the recycling bin d. a space shuttle being launched 2. Which of the following is not an example of projectile motion? a. a volleyball served over a net c. a hot-air balloon drifting toward Earth b. a baseball hit by a bat d. a long jumper in action 3. What is the path of a projectile (in the absence of friction)? a. a wavy line b. a parabola c. a hyperbola d. Projectiles do not follow a predictable path. 4. Which of the following exhibits parabolic motion? a. a stone thrown into a lake c. a leaf falling from a tree b. a space shuttle orbiting Earth d. a train moving along a flat track 5. Which of the following does not exhibit parabolic motion? a. a frog jumping from land into water b. a basketball thrown to a hoop c. a flat piece of paper released from a window d. a baseball thrown to home plate
1
The figure above shows the path of a ball tossed from a building. Air resistance is ignored.
____
6. At what point of the ball’s path shown in the figure above is the vertical component of the ball’s velocity zero? a. A b. B
____
____
____
7. In the figure above, the magnitude of the ball’s velocity is least at location a. A. c. C. b. B. d. D. 8. In the figure above, the magnitude of the ball’s velocity is greatest at location a. A. c. C. b. B. d. D. 9. In the figure above, the horizontal component of the ball’s velocity at A is a. zero. b. equal to the vertical component of the ball’s velocity at C. c. equal in magnitude but opposite in direction to the horizontal component of the ball’s d.
____
____
c. C d. D
velocity at D. equal to the horizontal component of its initial velocity.
10. In the figure above, at which point is the ball’s speed about equal to the speed at which it was tossed? a. A c. C b. B d. D 11. A track star in the long jump goes into the jump at 12 m/s and launches herself at 20.0° above the horizontal. What is the magnitude of her horizontal displacement? (Assume no air resistance and that a y = –g = –9.81 m/s 2 .) a. 4.6 m b. 9.2 m
c. 13 m d. 15 m
2
____
____
12. Which of the following is a coordinate system for specifying the precise location of objects in space? a. x-axis c. frame of reference b. y-axis d. diagram 13. A passenger on a bus moving east sees a man standing on a curb. From the passenger’s perspective, the man appears to a. stand still. b. move west at a speed that is less than the bus’s speed. c. move west at a speed that is equal to the bus’s speed. d. move east at a speed that is equal to the bus’s speed.
____
14. A piece of chalk is dropped by a teacher walking at a speed of 1.5 m/s. From the teacher’s perspective, the chalk appears to fall a. straight down. b. straight down and backward.
____
c. straight down and forward. d. straight backward.
15. A dart is thrown horizontally toward X with a speed of 20 m/s. It hits a point Y 0.2 s later. (See diagram #2-67) The distance XY will be approximately
____
a. 2 m
d. 0.2 m
b. 1 m c. 0.5 m
e.
0.05 m
16. An object is thrown horizontally with a velocity of 30 m/s from the top of a tower. It undergoes a constant downward acceleration of 10 m/sß. The magnitude of its instantaneous velocity after 4 s, in m/s, is a. 10 d. 70 b. 40 e. 120 c. 50
____
17. A projectile is fired from ground level such that is has an initial vertical speed of 20 m/s and initial horizontal speed of 30 m/s. How far from the point of firing does the projectile land? Assume that the terrain is flat, neglect air resistance and take g = - 9.8 m/s/s. a. 40 m d. 120 m b. 60 m e. 180 m c. 80 m
3
____
18. A small projectile is launched horizontally in a vacuum and follows a path from X through Y as shown in figure #2-68. Choose the vector which best represents the net force acting on the particle at Y. (See diagram #2-69)
a. 1 b. 2 c. 3
____
d. 4 e. 5
19. A steel ball is placed at the top of the ramp shown in the figure in diagram #2-72 and released. The ramp is curved from x to y. (Consider the ramp to be frictionless.) The acceleration of the ball at position 'R' is best represented by the vector (See diagram #2-73)
a. A b. B c. C
d. D e. E
4
____
20. An object is projected horizontally at 400 m/s. If the object falls freely to the ground in 2 s, at what height did it begin its fall? a. 5 m b. 10 m
____
c. 20 m d. 200 m
21. A machine launches a tennis ball at an angle of 45º with the horizontal. The ball has an initial vertical velocity of 9.0 meters per second and an initial horizontal velocity of 9.0 meters per second. The ball reaches its maximum height 0.92 second after its launch. [Neglect air resistance and assume the ball lands at the same height abovethe ground from which it was launched.] The speed of the tennis ball as it leaves the launcher is approximately a. 4.5 m/s c. 13 m/s b. 8.3 m/s d. 18 m/s
____
22. A machine launches a tennis ball at an angle of 45º with the horizontal. The ball has an initial vertical velocity of 9 meters per second and an initial horizontal velocity of 9 meters per second.The ball reaches its maximum height 0.92 second after its launch. [Neglect air resistance and assume the ball lands at the same height above the ground from which it was launched.] The total horizontal distance traveled by the tennis ball during the entire time it is in the air is approximately a. 23 m c. 8.3 m b. 17 m d. 4.1 m
____
23.
The diagram shows the muzzle of a cannon located 50 meters above the ground. When the cannon is fired, a ball leaves the muzzle with an initial horizontal speed of 250 meters per second.[Neglect air resistance.] Which action would most likely increase the time of flight of a ball fired by the cannon? a. pointing the muzzle of the cannon toward the c. positioning the cannon higher above the ground ground
b. moving the cannon closer to the edge of the
d. giving the ball a greater initial horizontal
cliff
____
velocity
24. A student standing on a knoll throws a snowball horizontally 4.5 meters above the level ground toward a smokestack 15 meters away. The snowball hits the smokestack 0.65 second after being released. [Neglect air resistance.] Approximately how far above the level ground does the snowball hit the smokestack? a. 0 m c. 2.4 m b. 0.4 m d. 4.5 m
5
Exhibit 4-2 A gun is held horizontally and fired. At the same time the bullet leaves the gun's barrel an identical bullet is dropped from the same height. Neglect air resistance. ____
____
____
25. Refer to Exhibit 4-2. Which bullet will hit the ground first? a. The bullet that was fired. b. The bullet that was dropped. c. It will be a tie. 26. Refer to Exhibit 4-2. Which bullet will hit the ground with the greater velocity? a. The bullet that was fired. b. The bullet that was dropped. c. It will be a tie. 27. Refer to Exhibit 4-2. Which would hit the ground first if this experiment were conducted on the surface of the Moon? a. The bullet that was fired. b. The bullet that was dropped. c. It will be a tie.
____
28. Refer to Exhibit 4-2. If the bullets were not identical, but rather the dropped bullet had twice the mass of the other, which bullet would hit the ground first? a. The bullet that was fired. b. The bullet that was dropped. c. It will be a tie.
____
29. A 2-kg ball is thrown horizontally at a speed of 10 m/s. At the same time a 1-kg ball is dropped from the same height. Ignoring air resistance, which ball hits the ground first? a. the 1-kg ball b. the 2-kg ball c. It's a tie.
____
30. A red ball is thrown straight down from the edge of a tall cliff with a speed of 30 m/s. At the same time a green ball is thrown straight up with the same speed. How many seconds later than the red ball will the green ball land? a. 3 s b. 6 s c. 10 s d. There is not enough information to say.
____
31. A red ball is thrown straight down from the edge of a tall cliff with a speed of 30 m/s. At the same time a green ball is thrown straight up with the same speed. Which ball (if either) will be traveling faster when it reaches the ground below? a. the red ball b. the green ball c. Both balls will have the same speed.
6
____
____
____
32. Which of the following statements about projectile motion is true? a. The horizontal and vertical motions are independent. b. The force on the projectile is constant throughout the flight. c. The acceleration of the projectile is constant throughout the flight. d. All of the above statements are true. 33. In projectile motion the a. acceleration is parallel (or antiparallel) to the velocity. b. acceleration is perpendicular to the velocity. c. acceleration is vertical, while the velocity can be in any direction. d. acceleration is vertical and the velocity is horizontal. 34. A baseball player throws a ball from left field toward home plate. Assume that you can neglect the effects of air resistance. At the instant the ball reaches its highest point, what is the direction of the ball's velocity? a. up b. down c. horizontal d. The velocity is zero.
____
35. A football quarterback throws a long pass toward the end zone. Assume that you can neglect the effects of air resistance. At the instant the ball reaches its highest point, what is the direction of the net force on the ball? a. up b. down c. horizontal d. The net force is zero.
____
36. A baseball player throws a ball from left field toward home plate. Assume that you can neglect the effects of air resistance. At the instant the ball reaches its highest point, what is the direction of the ball's acceleration? a. up b. down c. horizontal d. The acceleration is zero.
____
37. A football quarterback throws a long pass toward the end zone. Assume that you can neglect the effects of air resistance. At the instant the ball reaches its highest point, what is the acceleration of the ball? a. zero b. 10 m/s2 downward c. 10 m/s2 upward
____
38. A physics student reports that upon arrival on planet X, he promptly sets up the "monkey-shoot" demonstration. If the gravity on planet X is twice what it is on Earth, he should obtain a a. miss because the monkey's weight is twice as big on planet X. b. hit only if the ball's horizontal velocity is increased. c. miss because the monkey's mass is unchanged. d. hit because the ball and the monkey fall vertically with the same acceleration.
7
____
39. A baseball is hit with a horizontal speed of 22 m/s and a vertical speed of 14 m/s upward. What are these speeds 1 s later? a. 22 m/s horizontal and 4 m/s upward b. 22 m/s horizontal and 24 m/s upward c. 12 m/s horizontal and 4 m/s upward d. 12 m/s horizontal and 14 m/s upward
____
40. After being hit, a baseball has a horizontal speed of 20 m/s and a vertical speed of 25 m/s upward. Ignoring air resistance what are these speeds 1 s later? a. 20 m/s horizontal and 25 m/s vertical b. 20 m/s horizontal and 15 m/s vertical c. 10 m/s horizontal and 25 m/s vertical d. 20 m/s horizontal and 35 m/s vertical
____
41. A rock is thrown off a tall cliff with a vertical speed of 25 m/s upward and a horizontal speed of 30 m/s. What will these speeds be 3 s later? a. 25 m/s upward and 30 m/s horizontal b. 5 m/s downward and 30 m/s horizontal c. 25 m/s upward and 0 m/s horizontal d. 30 m/s downward and 60 m/s horizontal
____
42. An ashtray slides across a table with a speed of 0.9 m/s and falls off the edge. If it takes 0.4 s to reach the floor, how far from the edge of the table does the ashtray land? a. 0.36 m b. 0.4 m c. 0.9 m d. 1.3 m
____
43. A car drives off a vertical cliff at a speed of 24 m/s. If it takes 3 s for the car to hit the ground, how far from the base of the cliff does it land? a. 3 m b. 8 m c. 24 m d. 72 m
____
44. A rock is thrown off a tall cliff with a vertical speed of 25 m/s upward and a horizontal speed of 30 m/s. If the rock lands 8 s later, how far from the base of the cliff will it land? a. 30 m b. 120 m c. 165 m d. 240 m
____
45. A bowling ball rolls off the edge of a giant's table at 15 m/s. If it takes 4 s for the ball to hit the ground, how far does it land from the base of the table? a. 10 m b. 15 m c. 40 m d. 60 m
8
____
46. A bowling ball rolls off the edge of a giant's table at 15 m/s. If it takes 4 s for the ball to hit the ground, what is the height of the table? a. 40 m b. 60 m c. 80 m d. 160 m
____
47. Angel Falls in southeastern Venezuela is the highest uninterrupted waterfall in the world, dropping 979 m (3212 ft). Ignoring air resistance, it would take 14 s for the water to fall from the lip of the falls to the river below. If the water lands 50 m from the base of the vertical cliff, what was its horizontal speed at the top? a. 3.6 m/s b. 9.8 m/s c. 50 m/s d. 700 m/s
____
48. A baseball is hit with a vertical speed of 10 m/s and a horizontal speed of 30 m/s. How long will the ball remain in the air? a. 1 s b. 2 s c. 3 s d. 6 s
____
49. A tennis ball is hit with a vertical speed of 10 m/s and a horizontal speed of 30 m/s. How far will the ball travel horizontally before landing? a. 30 m b. 40 m c. 60 m d. 80 m
9
ID: A
Projectile Motion Question Set Answer Section MULTIPLE CHOICE 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. 36.
B C B A C B B D D C B C C A D C D B C C C B B A C A C C C B C D C C B B 1
ID: A 37. 38. 39. 40. 41. 42. 43. 44. 45. 46. 47. 48. 49.
B D A B B A D D D C A B C
2