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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

3.0 Accelerated Motion: Acceleration, Constant-Acceleration Equations and Free Fall – Check yourself

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Accelerated Motion American Physics check yourself quiz: free practice for American System Physics. Work through this Accelerated Motion American Physics check yourself quiz and get instant feedback on every answer. If you get stuck, review the 3.3 Free Fall — Notes lesson. More practice: American System Physics — all units. Syllabus: OpenStax free science textbooks.

  • Questions count: 19
  • Passing grade: B+
  • Time limit: 10 minutes
Start Quiz
1.
A ball thrown up: acceleration at the top is
0
9.8 m/s² down
9.8 m/s² up
maximum velocity
2.
Which statement best describes Free fall?
Graph of v against t; slope = acceleration, area = displacement.
About 9.8 m/s² downward near Earth's surface.
Constant acceleration.
Motion under gravity alone.
3.
Which statement best describes Acceleration due to gravity (g)?
About 9.8 m/s² downward near Earth's surface.
Rate of change of velocity: a = Δv ÷ Δt.
Graph of v against t; slope = acceleration, area = displacement.
Motion under gravity alone.
4.
A light gate measured the speed v of a ball dropped from rest through different heights h. The graph of v² against h is a straight line through the origin. Since v² = 2gh, what is g?
Dr Dabour Hub Academy - figure 1
20 m/s²
9.8 m/s²
4.9 m/s²
0.1 m/s²
5.
In the apparatus shown, the ball is released 0.60 m above the gate and takes 0.352 s to reach it. What value of g does this give?
Dr Dabour Hub Academy - figure 2
4.8 m/s²
3.4 m/s²
9.7 m/s²
1.7 m/s²
6.
The graph shows a table-tennis ball dropped from a tall building. Which statement explains its motion at point C?
Dr Dabour Hub Academy - figure 3
It has stopped because gravity no longer acts
It still accelerates at 9.8 m/s²
It falls at terminal velocity because air resistance equals its weight
It is slowing down because air resistance exceeds its weight
7.
Which result correctly states the mean of the fall times in the table with an uncertainty of half the range?
0.79 ± 0.05 s
0.81 ± 0.03 s
0.78 ± 0.01 s
0.79 ± 0.03 s
8.
One reading in this table of fall times does not fit the pattern. Which is it, and what should be done?
0.31 s at 0.50 m; double it
0.62 s at 1.50 m; repeat it and exclude it from the mean
0.46 s at 1.00 m; ignore the whole row
None; all the readings are equally valid
9.
A diver steps off a 30 m cliff. Ignoring air resistance, how fast is she going when she reaches the water? (g = 9.8 m/s²)
588 m/s
17.1 m/s
24.2 m/s
294 m/s
10.
A basketball is thrown straight up at 9.8 m/s. How high above the release point does it go? (g = 9.8 m/s², no air resistance)
4.9 m
9.8 m
0.5 m
1 m
11.
With up taken as positive, a stone is launched vertically at 20 m/s. What is its velocity 3.0 s later? (g = 9.8 m/s²)
49.4 m/s
9.4 m/s
-9.4 m/s
5.3 m/s
12.
A student's stopwatch timings gave g = 10.3 m/s². By what percentage does this differ from the accepted 9.8 m/s²?
5.1 %
0.5 %
4.9 %
51 %
13.
A friend drops a ruler and you catch it after it has fallen 20 cm. Assuming free fall from rest, what is your reaction time? (g = 9.8 m/s²)
2 s
0.2 s
0.041 s
0.14 s
14.
A set of keys dropped from a balcony hits the ground 2.2 s later, so the balcony is _____ above the ground (g = 9.8 m/s², no air resistance).
47.4 m
21.6 m
10.8 m
23.7 m
15.
A tennis ball tossed straight up at 19.6 m/s comes back down to the height it was released from after _____ (g = 9.8 m/s²).
2 s
4 s
8 s
39.2 s
16.
On the table-tennis ball's graph, the acceleration at A is greater than the acceleration at B. True or false?
Dr Dabour Hub Academy - figure 4
False; it is greater at B because the ball is faster
False; the acceleration is the same at A and B
False; the acceleration is zero at A
True
17.
For symmetric vertical motion with no air resistance, the time going up equals the time coming down. True or false?
False; coming down takes longer
True
False; going up takes longer
True only if the object is heavy
18.
Because air resistance grows with speed, a falling object can reach a terminal velocity. True or false?
False; air resistance decreases with speed
False; falling objects always accelerate at g
True
True, but only in a vacuum
19.
Taking upward as positive, a ball falling downward has an acceleration of +9.8 m/s². True or false?
True
False; the acceleration is zero while it falls
False; the acceleration is −9.8 m/s only on the way up
False; the acceleration is −9.8 m/s² because it points downward
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Part of Accelerated Motion — see every lesson and quiz in this unit.
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