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CP Projectile Motion Practice
Test Description: Use this to help you study for our upcoming quiz!
Instructions: Answer all questions to get your test result.
1) A ball is thrown straight upward from the surface of Earth. Which statement best describes the ball’s velocity and acceleration at the top of its flight?
A
Velocity is nonzero and acceleration is zero.
B
Velocity is zero and acceleration is nonzero.
C
Both velocity and acceleration are zero.
D
Both velocity and acceleration are not zero.
2) A projectile with mass m is fired with initial horizontal velocity v from height h above level ground. Which change would have resulted in a greater time of flight for the projectile? Neglect friction.
A
increasing the height to 2h
B
increasing the initial horizontal velocity to 2v
C
decreasing the mass to m/2
D
decreasing the height to h/2
3) A soccer ball is kicked into the air with an initial speed of 20 m/s and returns to ground level. At which angle above the horizontal should it be kicked in order for it to travel the greatest range? (Neglect friction.)
A
75°
B
15°
C
45°
D
30°
4) Without air resistance, a kicked ball would reach a maximum height of 6.7 meters and land 38 meters away. With air resistance, the ball would travel
A
less than 38 m horizontally and less than 6.7 m vertically
B
6.7 m vertically and more than 38 m horizontally
C
38 m horizontally and less than 6.7 m vertically
D
more than 6.7 m vertically and less than 38 m horizontally
5) A ball is thrown with an initial speed of 10. meters per second. At what angle above the horizontal should the ball be thrown to reach the greatest height?
A
90°
B
0°
C
30°
D
45°
6) Two stones, A and B, are thrown horizontally from the top of a cliff. Stone A has an initial speed of 15 m/s and stone B has an initial speed of 30 m/s. Compared to the time it takes stone A to land, the time it takes stone B to land is
A
the same
B
half as great
C
four times as great
D
twice as great
7) A projectile launched at an angle of 45° above the horizontal travels through the air. Compared to the projectile’s theoretical path with no air friction, the actual trajectory of the projectile with air friction is
A
lower and longer
B
lower and shorter
C
higher and longer
D
higher and shorter
8) Two spheres are simultaneously projected horizontally from the top of a tower. Sphere A has a horizontal speed of 40 m/s and sphere B has a horizontal speed of 20 m/s. Which statement best describes the landing time and range? (Neglect friction.)
A
Sphere A hits the ground before sphere B, and sphere A lands twice as far as sphere B from the base of the tower.
B
Both spheres hit the ground at the same time, but sphere A lands twice as far as sphere B from the base of the tower.
C
Both spheres hit the ground at the same time, but sphere B lands twice as far as sphere A from the base of the tower.
D
Both spheres hit the ground at the same time and at the same distance from the base of the tower.
9) A projectile is launched with an initial speed v at a launch angle of 30° above the ground. It lands on the ground 2 s later. How does the horizontal distance traveled change as the launch angle is increased from 30° to 45° above the horizontal?
A
The total horizontal distance will increase
B
The total horizontal distance will increase
C
I don't care
D
The total horizontal distance will remain the same
10) A projectile is launched with an initial speed v at a launch angle of 30° above the ground. It lands on the ground 2 s later. How does the maximum height of the projectile change as the launch angle is increased from 30° to 45° above the horizontal?
A
The projectile's maximum height will remain the same
B
The projectile's maximum height will increase
C
Leave me alone
D
The projectile's maximum height will decreaase
11) A machine launches a tennis ball at an angle of 25° above the horizontal at a speed of 14 meters per second. The ball returns to level ground. Which combination of changes must produce an increase in time of flight of a second launch?
A
decrease the launch angle and decrease the ball’s initial speed
B
increase the launch angle and decrease the ball’s initial speed
C
decrease the launch angle and increase the ball’s initial speed
D
increase the launch angle and increase the ball’s initial speed
12) A golf ball is hit at an angle of 45° above the horizontal. What is the acceleration of the golf ball at the highest point in its trajectory? Neglect friction.
A
6.9 m/s^2 horizontal
B
0.0 m/s^2
C
9.8 m/s^2 upward
D
9.8 m/s^2 downward
13) A 0.2 kg red ball is thrown horizontally at a speed of 4 m/s from a height of 3 m. A 0.4 kg green ball is thrown horizontally from the same height at a speed of 8 m/s. Compared to the flight time of the red ball, the flight time of the green ball is
A
twice as great
B
the same
C
four times as great
D
one-half as great
14) A ball thrown vertically upward reaches a maximum height of 30. meters above the surface of Earth. At its maximum height, the speed of the ball is
A
0.0 m/s
B
9.8 m/s
C
3.1 m/s
D
24 m/s
15) An archer uses a bow to fire two arrows with the same force. One arrow is fired at 60° with the horizontal, and the other is fired at 45° with the horizontal. Compared to the arrow fired at 60°, the arrow fired at 45° has a
A
shorter flight time and shorter horizontal range
B
longer flight time and shorter horizontal range
C
shorter flight time and longer horizontal range
D
longer flight time and longer horizontal range
16) A 2-kilogram block is dropped from the roof of a tall building at the same time a 6-kilogram ball is thrown horizontally from the same height. Which statement best describes the motion of the block and the motion of the ball? (Neglect air friction.)
A
The 6-kg ball hits the ground first because it is round.
B
The 6-kg ball hits the ground first because it has more mass.
C
The block and the ball hit the ground at the same time because they have the same vertical acceleration.
D
The 2-kg block hits the ground first because it has no horizontal velocity.
*select an answer for all questions
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