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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

9.1 Impulse and Momentum – Quiz

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Impulse and Momentum American Physics quiz: free practice for American System Physics. Work through this Impulse and Momentum American Physics quiz and get instant feedback on every answer. If you get stuck, review the 9.1 Impulse and Momentum — 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 tennis racket strikes a ball. The graph shows the force on a 0.058 kg ball, initially at rest, while it is struck. What is the ball's speed just after the impact?
Dr Dabour Hub Academy - figure 1
34.5 m/s
1.50 m/s
25.9 m/s
12.9 m/s
2.
The graph shows the momentum of a cart. What resultant force acts on it between t = 0 and t = 4 s, and between t = 4 s and t = 7 s?
Dr Dabour Hub Academy - figure 2
12 N, then 12 N
3.0 N, then 3.0 N
48 N, then 0 N
3.0 N, then 0 N
3.
In the lab data plotted, what does the gradient of the best-fit line represent and what is its approximate value?
Dr Dabour Hub Academy - figure 3
The contact time, about 0.4 s
The kinetic energy, about 0.4 J
The change in momentum, about 0.4 N·s
The mass of the trolley, about 2.5 kg
4.
The graph compares the force on a jumper who lands with straight legs and with bent knees. Which statement is correct?
Dr Dabour Hub Academy - figure 4
Bending the knees reduces the impulse, which reduces the force
Straight legs give the larger impulse because the peak force is higher
Bending the knees increases the change in momentum of the jumper
The areas are equal, so the impulse is the same, but bending the knees lowers the peak force
5.
Use the velocity–time graph for a 1200 kg test car. What average force acts on the car during the impact?
Dr Dabour Hub Academy - figure 5
2.4 × 105 N
8.0 × 104 N
2400 N
4.8 × 106 N
6.
Use the force–time graph to find the speed of the 2.0 kg cart at t = 2.0 s.
Dr Dabour Hub Academy - figure 6
10 m/s
7.5 m/s
2.5 m/s
5.0 m/s
7.
The trace shows the force on a ball during its 20 ms contact with a force plate. What is the average force during the contact?
Dr Dabour Hub Academy - figure 7
300 N
3.0 N
150 N
6000 N
8.
The bar chart shows a ball's momentum just before and just after it bounces off a wall. What impulse did the wall give the ball?
Dr Dabour Hub Academy - figure 8
−0.6 N·s
+4.2 N·s
+0.6 N·s
−4.2 N·s
9.
Which conclusion is best supported by these results?
Every egg has the same Δp (0.24 kg·m/s); the eggs survive when the average force is at most 8.0 N because the stopping time is long
Softer surfaces reduce the change in momentum of the egg, so it survives
The egg on foam receives a larger impulse, so it survives
Stopping time has no effect because the egg always hits at 4.0 m/s
10.
A student measures the speed of a glider on a level air track. A 0.2 kg glider carries the card. Using the mean time in the table, what is the glider's momentum?
24.4 kg·m/s
0.244 kg·m/s
2.44 × 10-4 kg·m/s
1.22 kg·m/s
11.
The table shows the momentum of a braking car at different times. What resultant force acts on the car?
3000 N (in the direction of motion)
1000 N (opposite to the motion)
3000 N (opposite to the motion)
18000 N (opposite to the motion)
12.
Two carts in the table have the same momentum. Which statement is correct?
Both carts have the same kinetic energy
Cart B has four times the kinetic energy of cart A
Cart A has four times the kinetic energy of cart B
Cart A has twice the kinetic energy of cart B
13.
Balls are thrown at a force plate and the average force and contact time are recorded. Which ball had the greatest change in momentum?
Golf ball
Tennis ball
Cricket ball
Squash ball
14.
A data logger records the contact time of a bouncing ball five times. What are the mean and its uncertainty (half the range)?
12.3 ms ± 0.55 ms
12.3 ms ± 1.1 ms
12.9 ms ± 0.55 ms
12.3 ms ± 0.05 ms
15.
Test data for the 5.0 kg head of a crash-test dummy are shown in the table. What is the average force on the head with the air bag?
1875 N
375 N
15 N
75 N
16.
Balls hit a wall head-on and rebound straight back. Which ball receives the largest impulse from the wall?
Ball B
Ball C
Ball A
Ball D
17.
A player practises returns against a wall. A 0.057 kg tennis ball hits a wall at 30 m/s and rebounds along the same line at 25 m/s. Taking its initial direction as positive, what impulse does the wall give it?
-3.14 N·s
-0.285 N·s
3.14 N·s
1.71 N·s
18.
A baseball's velocity is reversed by a bat. The mass is 0.145 kg, its velocity changes by 70 m/s and the contact lasts 1.2 ms. What is the magnitude of the average force?
0.0122 N
8460 N
8.46 N
58300 N
19.
In a crash test the head of a dummy has a momentum change of 24 kg·m/s. Without a cycle helmet it stops in 0.02 s; with a cycle helmet it stops in 0.3 s. What is the average force on the head with a cycle helmet?
1200 N
7.20 N
1120 N
80.0 N
20.
A resultant force of 2.0 N acts on a 0.50 kg glider for 3.0 s. By how much does its velocity change?
12 m/s
3.0 m/s
6.0 m/s
0.75 m/s
21.
A 1000 kg car travelling at 25 m/s is brought to rest by an average braking force of 5000 N. How long does it take to stop?
0.20 s
5.0 s
125 s
50 s
22.
A student wants to find the average force of a kick on a ball. Which method gives the most reliable result?
Estimate the contact time with a stopwatch and divide the ball's weight by it
Kick the ball against a force plate connected to a fast data logger and find the area under the force–time graph
Measure how high the ball bounces and divide by the kick time
Use a bathroom scale under the foot and read the largest value
23.
In which direction does the impulse on an object act?
Always in the direction of the initial velocity
In the direction of the net force
Always opposite to the final velocity
Impulse has no direction because it is a scalar
24.
After finding the impulse on a ball from its initial and final momentum, what is the next step to find the average force?
Multiply the impulse by the contact time
Divide the impulse by the mass
Divide the impulse by the contact time
Square the impulse and halve it
25.
A gymnast jumps down from a vault. Which action most reduces the average force on her legs?
Landing with straight legs so she stops quickly
Jumping from a greater height
Landing on a hard floor instead of a mat
Bending her knees as she lands so she stops over a longer time
26.
A student claims a padded dashboard protects passengers because it reduces the impulse on them. Evaluate the claim.
Incorrect: the impulse is set by the passenger's change in momentum; the padding lengthens the stopping time so the force is smaller
Correct: padding absorbs impulse so less reaches the passenger
Correct: padding reduces the passenger's speed before the crash
Incorrect: padding increases the force but spreads it over a larger area
27.
A car-safety leaflet describes what each feature changes during a crash. Which pairing is correct?
Seat belt — increases stopping time and spreads the force over a larger area
Air bag — reduces the head's change in momentum
Crumple zone — makes the car stop in a shorter time
Helmet foam — increases the force on the skull
28.
On a formula sheet, each momentum-related quantity is written next to its defining equation. Which pairing is correct?
Momentum — ½mv²
Impulse — FΔt
Kinetic energy — mv
Average force — Δp × Δt
29.
A student classifies physical quantities as scalar or vector and gives the unit of each. Which pairing is correct?
Momentum — scalar, measured in J
Impulse — scalar, measured in N
Kinetic energy — scalar, measured in J
Velocity — scalar, measured in m/s
30.
A glossary gives the meaning of several key terms from the impulse topic. Which pairing is correct?
Resultant force — the largest force during an impact
Impulse — the rate of change of momentum
Change in momentum — initial minus final momentum
Average force — the constant force that gives the same impulse over the same time
31.
A 150 N average force acts on a ball for 0.040 s. The impulse on the ball is _____.
6.0 N·s
3750 N·s
0.00027 N·s
6000 N·s
32.
In momentum form, Newton's second law says the resultant force equals the rate of change of _____.
velocity
momentum
kinetic energy
impulse
33.
A 1500 kg car slows from 20 m/s to 5.0 m/s. The magnitude of its change in momentum is _____.
3.75 × 104 kg·m/s
7.50 × 103 kg·m/s
2.25 × 104 kg·m/s
2.81 × 105 kg·m/s
34.
The SI unit of impulse, N·s, is equivalent to _____.
kg·m/s²
J
N/s
kg·m/s
35.
If the change in momentum stays the same but the contact time is doubled, the average force is _____.
halved
doubled
unchanged
quartered
36.
Momentum is a vector that points in the same direction as the object's velocity. True or false?
False
True
False, because momentum is a scalar
True only for objects moving in a straight line
37.
The impulse on an object has the same direction as the force that produces it. True or false?
False
False, it has the direction of the final velocity
True
True only if the object starts at rest
38.
For the same incoming speed, a ball that bounces back from a wall has a larger change in momentum than an identical ball that sticks to the wall. True or false?
False
False, because a ball that stops loses all its momentum
True only if the bounce is perfectly elastic
True
39.
A seat belt that stretches slightly increases the passenger's change in momentum during a crash. True or false?
False
True
True, because it holds the passenger longer
True only in head-on crashes
40.
If the resultant force on an object is zero, its momentum does not change. True or false?
False
True
False, because its speed can still change
True only when the object is at rest
41.
Kinetic energy is a vector quantity measured in kg·m/s. True or false?
True
True, because it depends on velocity
False
True only for objects moving in a straight line
42.
Doubling an object's speed doubles its momentum but multiplies its kinetic energy by four. True or false?
False
False, both quantities double
False, both quantities quadruple
True
43.
The area under a force–time graph equals the change in kinetic energy of the object. True or false?
False
True
True, because force times time is energy
True only when the force is constant
44.
A crumple zone works by decreasing the collision time. True or false?
True
False
True, because the car stops faster
True only at high speeds
45.
Helmet foam protects the skull by increasing the time the head takes to stop. True or false?
False
False, it reduces the head's change in momentum
True
True only if the foam is rigid
46.
An object with a larger momentum always needs a larger force to stop it. True or false?
True
True, because F = Δp/Δt
True only if both objects have the same mass
False
47.
A 0.10 kg ball at 20 m/s has more momentum than a 2.0 kg ball at 1.0 m/s. True or false?
False
True
True, because it is much faster
True only if they move in opposite directions
48.
Repeating force-sensor measurements and averaging them reduces random error but does not remove a systematic error. True or false?
False
True
False, averaging removes all errors
True only if there are more than ten repeats
49.
A force sensor that reads 2.0 N when nothing is touching it introduces a systematic (zero) error into every force reading. True or false?
False
False, it is a random error
True
True only when the force is small
50.
Following through when hitting a golf ball can increase the ball's launch speed because the club stays in contact for longer, giving a larger impulse. True or false?
False
False, because follow-through happens after the ball has left
True only if the club head is heavier than the ball
True
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Part of Momentum and Its Conservation — see every lesson and quiz in this unit.
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