CP Projectile Motion Practice Question Preview (ID: 53318)
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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) Both spheres hit the ground at the same time and at the same distance 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) Sphere A hits the ground before sphere B, and sphere A lands twice as far as sphere B from the base of the tower.
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 shorter
b) lower and longer
c) higher and shorter
d) higher and longer
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) twice as great
c) half as great
d) four times as great
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) 0°
b) 30°
c) 45°
d) 90°
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) 6.7 m vertically and more than 38 m horizontally
b) 38 m horizontally and less than 6.7 m vertically
c) more than 6.7 m vertically and less than 38 m horizontally
d) less than 38 m horizontally and less than 6.7 m vertically
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) 15°
b) 30°
c) 45°
d) 75°
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) decreasing the mass to m/2
b) decreasing the height to h/2
c) increasing the initial horizontal velocity to 2v
d) increasing the height to 2h
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) Both velocity and acceleration are zero.
b) Velocity is zero and acceleration is nonzero.
c) Velocity is nonzero and acceleration is zero.
d) Both velocity and acceleration are not zero.
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 remain the same
c) The total horizontal distance will increase
d) I don't care
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 decreaase
b) The projectile's maximum height will remain the same
c) The projectile's maximum height will increase
d) Leave me alone
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) decrease the launch angle and increase the ball’s initial speed
c) increase the launch angle and decrease the ball’s initial speed
d) increase the launch angle and increase the ball’s initial speed
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) 9.8 m/s^2 upward
b) 9.8 m/s^2 downward
c) 6.9 m/s^2 horizontal
d) 0.0 m/s^2
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) one-half as great
b) twice as great
c) the same
d) four times as great
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) 3.1 m/s
c) 9.8 m/s
d) 24 m/s
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) longer flight time and longer horizontal range
b) longer flight time and shorter horizontal range
c) shorter flight time and longer horizontal range
d) shorter flight time and shorter horizontal range
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 2-kg block hits the ground first because it has no horizontal velocity.
b) The 6-kg ball hits the ground first because it has more mass.
c) The 6-kg ball hits the ground first because it is round.
d) The block and the ball hit the ground at the same time because they have the same vertical acceleration.
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