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Course: American System Physics
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American System Physics

A Physics Toolkit

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Representing Motion

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Accelerated Motion

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Forces in One Dimension

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Displacement and Force in Two Dimensions

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Motion in Two Dimensions

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Gravitation

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Rotational Motion

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Momentum and Its Conservation

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Energy and Its Conservation

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Thermal Energy

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States of Matter

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Vibrations and Waves

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Sound

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Fundamentals of Light

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Reflection and Refraction

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Interference and Diffraction

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Electrostatics

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Electric Current and Circuits

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Magnetic Fields

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Electromagnetic Induction and Electromagnetism

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Quantum Theory and the Atom

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Solid-State Electronics

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Nuclear and Particle Physics

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Quiz

6.1 Projectile Motion – Quiz

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Projectile Motion American Physics quiz: free practice for American System Physics. Work through this Projectile Motion American Physics quiz and get instant feedback on every answer. If you get stuck, review the 6.1 Projectile Motion — Notes lesson. More practice: American System Physics — all units. Syllabus: OpenStax free science textbooks.

  • Questions count: 50
  • Passing grade: A-
  • Time limit:
Start Quiz
1.
A toy car rolls off a 1.25 m high table. How long does it take to reach the floor?
0.505 s
0.357 s
0.255 s
0.128 s
2.
A skateboarder leaves a 0.80 m high wall horizontally at 4.0 m/s. How far from the wall does she land?
1.14 m
1.62 m
0.653 m
1.63 m
3.
A diver runs off a 30 m cliff horizontally at 5.0 m/s. What is her speed just before hitting the water?
29.2 m/s
24.2 m/s
24.8 m/s
5.00 m/s
4.
A stone is thrown horizontally at 8.0 m/s and lands 1.5 s later. At what angle below the horizontal is it moving on impact?
28.6°
45°
0°
61.4°
5.
A javelin is thrown at 24 m/s at 40° above the horizontal. What is the horizontal component of its initial velocity?
18.4 m/s
15.4 m/s
24.0 m/s
20.1 m/s
6.
A football is kicked at 18 m/s at 50° above level ground. What is its time of flight?
1.41 s
2.81 s
3.67 s
2.36 s
7.
A water jet leaves a fountain nozzle at 12 m/s at 60° above horizontal. How high above the nozzle does it rise?
7.35 m
11.0 m
5.51 m
1.84 m
8.
A golf ball leaves the club at 22 m/s at 35° above a level fairway. What is its range?
49.4 m
56.7 m
23.2 m
46.4 m
9.
At the highest point of a basketball's flight toward the hoop, which statement is correct?
Its vertical velocity is zero but its horizontal velocity is not
Its velocity is zero
Its acceleration is zero
Its horizontal velocity is zero
10.
A bullet is fired horizontally at the same moment an identical bullet is dropped from the same height over level ground. Which lands first (no air resistance)?
The dropped bullet
They land at the same time
The fired bullet
It depends on the firing speed
11.
A ball is kicked at 15° and again at the same speed at 75° over level ground. How do the two flights compare?
The 75° kick goes further
The 15° kick goes higher
Same range; the 75° kick stays in the air longer and goes higher
Same range and same time of flight
12.
What shape is the path of a projectile when air resistance is ignored?
A circle
A straight line
An ellipse centred on the launch point
A parabola
13.
The table gives the launch data for a tennis lob. How long does the ball take to reach the top of its path?
1.00 s
2.00 s
0.500 s
0.790 s
14.
The graph shows how the range of a 20 m/s projectile depends on launch angle. Which statement does it support?
Dr Dabour Hub Academy - figure 1
Range increases steadily up to 90°
Angles of 20° and 70° give the same range, and the maximum (about 41 m) is at 45°
The maximum range is at 30°
A 70° launch travels twice as far as a 20° launch
15.
The diagram shows positions every 0.2 s of a dropped ball and a ball launched horizontally at the same moment. What do the matching heights at each instant show?
Dr Dabour Hub Academy - figure 2
The launched ball falls faster
Horizontal velocity decreases
Vertical motion is independent of horizontal motion
Heavier balls fall faster
16.
For the projectile in the diagram, how does its acceleration at P compare with that at R?
Dr Dabour Hub Academy - figure 3
Upward at P, downward at R
Zero at P, 9.8 m/s² at R
Larger at R because it is falling
The same: 9.8 m/s² vertically downward at both
17.
Using the launch speed and angle labelled on the diagram, find the speed at Q, the top of the path.
Dr Dabour Hub Academy - figure 4
9.18 m/s
13.1 m/s
16.0 m/s
8.00 m/s
18.
The graph shows the vertical velocity of a thrown ball from launch until it returns to launch height. What maximum height does it reach?
Dr Dabour Hub Academy - figure 5
22.0 m
11.0 m
7.35 m
16.5 m
19.
What does the gradient of this vertical-velocity graph represent, and what is its value?
Dr Dabour Hub Academy - figure 6
The horizontal velocity, 9.8 m/s
The height, 9.8 m
The acceleration due to gravity, −9.8 m/s²
The launch angle, 45°
20.
The strobe image shows a ball's positions at equal time intervals after rolling off a ledge. What does the equal horizontal spacing of the images show?
Dr Dabour Hub Academy - figure 7
The ball is slowing down horizontally
The vertical velocity is constant
Gravity acts horizontally
The horizontal velocity is constant because no horizontal force acts
21.
Using the strobe graph, what was the ball's horizontal launch speed?
Dr Dabour Hub Academy - figure 8
2.50 m/s
1.00 m/s
0.400 m/s
5.00 m/s
22.
A coach wants a kick that travels as far as possible along level ground (air resistance ignored). According to the table, which launch angle should be used?
15°
45°
75°
90°
23.
Using the table, which pair of launch angles would give equal ranges at the same speed?
30° and 45°
20° and 80°
30° and 60°
45° and 90°
24.
Which result in the table is anomalous?
The range for 1.0 m/s
The range for 2.5 m/s
The range for 3.0 m/s
The range for 2.0 m/s
25.
For the data in the table, the gradient of range against launch speed equals the time of flight. What should this gradient be?
0.429 s
0.184 s
0.900 s
0.303 s
26.
What is the missing vertical velocity at t = 1.0 s in the table?
15.0 m/s
5.20 m/s
0.300 m/s
10.1 m/s
27.
Using the table, what is the speed of the projectile at t = 1.5 s?
12.3 m/s
0.300 m/s
12.0 m/s
15.0 m/s
28.
Students check vertical motion by timing drops (table). Using the 2.00 m row, what value of g do they obtain?
4.90 m/s²
6.26 m/s²
19.6 m/s²
9.80 m/s²
29.
Which procedure gives the most reliable measurement of a marble's horizontal launch speed?
Measure the bench height and the landing distance on carbon paper for several launches from the same release point, then use v = x/√(2h/g)
Time the fall with a stopwatch once
Estimate the speed by eye
Roll the marble from a different point each time
30.
Measured ranges in a projectile experiment are all about 5 % shorter than predicted. What is the most likely reason?
Random timing errors
Air resistance, a systematic effect the simple model ignores
The value of g is 5 % smaller in the lab
The ball speeds up horizontally
31.
The horizontal displacement of a projectile from launch to landing is its _____.
trajectory
altitude
period
range
32.
The curved path followed by a projectile is called its _____.
trajectory
range
orbit
displacement
33.
At maximum height the _____ component of a projectile's velocity is zero.
horizontal
vertical
total
tangential
34.
The horizontal acceleration of a projectile is zero when air resistance is ignored. True or false?
False, because it is 9.8 m/s²
False, because it equals the launch speed
True
True only when the launch is horizontal
35.
A projectile's horizontal velocity gradually decreases because gravity acts on it. True or false?
True
True only when the launch angle is small
False, because gravity acts horizontally
False, because gravity acts vertically, so vx stays constant
36.
Time is the only quantity shared by a projectile's horizontal and vertical motions. True or false?
True
False, because they share the same displacement
False, because they share the same acceleration
True only when the launch is at 45°
37.
Doubling the height of a horizontal launch doubles the time of flight. True or false?
True
False, because t = √(2h/g), so the time increases by a factor of √2
True only when the launch speed also doubles
False, because height has no effect on time
38.
If a marble leaves the same bench twice as fast, it lands twice as far from the bench. True or false?
False, because the range quadruples
False, because the range is unchanged
True
True only when the ball is heavy
39.
At the top of its path a projectile has zero acceleration. True or false?
True
True only when it is launched at 45°
False, because acceleration is upward at the top
False, because its acceleration is still g = 9.8 m/s² downward
40.
A ball rolling off a 4.9 m high ledge takes 1.0 s to land. True or false?
True
False, because it takes 0.5 s
False, because it takes 2.0 s
True only when it rolls slowly
41.
A projectile launched at 10 m/s at 30° has an initial vertical velocity of 8.7 m/s. True or false?
True
False, because vy = 10 sin30° = 5.0 m/s; 8.7 m/s is the horizontal part
True only when the ground is level
False, because vy = 10 m/s
42.
For the same launch speed on level ground, a 25° launch and a 65° launch travel equal horizontal distances. True or false?
False, because steeper launches always go further
False, because only 45° gives a range
True
True only when the ball is light
43.
A projectile's vertical velocity changes by 9.8 m/s every second. True or false?
False, because it changes by 4.9 m/s each second
False, because it stays constant
True only when it is falling
True
44.
The range of a projectile is its horizontal displacement from launch to landing. True or false?
True
False, because range is the maximum height
False, because range is the path length
True only when it lands at launch height
45.
A package dropped from a plane flying level stays directly below the plane (air resistance ignored). True or false?
False, because it falls straight down to the point below the release
True
False, because it falls behind the plane
True only when the plane is slow
46.
Timing a 0.4 s fall with a hand-held stopwatch gives a precise result. True or false?
True
True only when the stopwatch is digital
False, because human reaction time (about 0.2 s) is a large fraction of 0.4 s
False, because stopwatches are always exact
47.
Releasing a ball from the same marked point on a ramp is a way of controlling its launch speed. True or false?
False, because release point has no effect
False, because launch speed is set by the bench height
True only when the ramp is steep
True
48.
Landing a ball on carbon paper over white paper lets its landing point be measured accurately. True or false?
True
False, because carbon paper slows the ball
False, because marks cannot be measured
True only when the ball is large
49.
In an investigation of range against launch speed, the bench height is the independent variable. True or false?
True
False, because the launch speed is the independent variable; height is controlled
True only when the bench is tall
False, because range is the independent variable
50.
Plotting height against time squared for dropped objects should give a straight line through the origin with gradient g/2. True or false?
False, because the gradient should be g
False, because it should be a curve
True
True only when the heights are large
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Part of Motion in Two Dimensions — see every lesson and quiz in this unit.
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