AnswersPhysics Sem 1 2025-2026Unit Test

Unit Test — Unit test Answers

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Hiro walks up a flight of stairs in his apartment building. Later in the day, he runs up the same flight of stairs.

A
He did more work running than walking.
B
He did more work walking than running.
C
He had more power running than walking.
D
He had more power walking than running.
2
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A diver who has a mass of 68 kg climbs to a diving platform that is 7.5 m above the surface of a pool. How much gravitational potential energy does the diver have in relation to the pool’s surface?

A
510 J
B
1912 J
C
3825 J
D
4998 J
3

A crane does 9,500 J of work to lift a crate straight up using a force of 125 N. How high does the crane lift the crate?

A
0.013 m
B
76 m
C
9,400 m
D
1,200,000 m
4

How do the units of work and power compare?

A
The unit for work is a watt. The unit for power is a joule, which is a watt-second.
B
The unit for work is a watt. The unit for power is a joule, which is a watt per second.
C
The unit for work is a joule. The unit for power is a watt, which is a joule-second.
D
The unit for work is a joule. The unit for power is a watt, which is a joule per second.
5

The chart shows data for four different moving objects.

Question illustration
A
W, Y, X, Z
B
Z, X, Y, W
C
W, Y, Z, X
D
X, Z, Y, W
6

A ball has 116.62 J of gravitational potential energy at a height of 85 m. What is the mass of the ball?

A
0.14 kg
B
0.37 kg
C
11.9 kg
D
21.82 kg
7

According to the work-energy theorem, the amount of work done can be determined using which formula?

A
W = KE =
Option A
B
W = KE =
Option B
C
W = KE =
Option C
D
W = KE =
Option D
8

A 5,400 W motor is used to do work. If the motor is used for 640 s, about how much work could it do?

A
8.4 J
B
4,800 J
C
6,000 J
D
3,500,000 J
9

What is the unit for work?

A
watt
B
joule
C
newton
D
meter
10

Lenny wrote the steps he used to find the mass of an object with 400 J of energy moving at a velocity of 8 m/s.1. Find the square of 8 m/s, which is 64 m2/s2. 2. Divide kinetic energy, 400 J, by 64 m2/s2, which is 6.25 J per m2/s2.3. Divide 6.25 J per m2/s2 by 2 to get a mass of 3.125 kg.

A
In Step 1, he should have found the square root of 400 J instead of squaring 8 m/s.
B
In Step 1, he should have multiplied 8 m/s by 2 instead of squaring it.
C
In Step 2, he should have divided 64 m2/s2 by 400 J instead of dividing 400 J by 64 m2/s2.
D
In Step 3, he should have multiplied 6.25 J per m2/s2 by 2 instead of dividing it by 2.
11

Examine the scenarios.Scenario W: A force of 75 N moves a box 15 m.Scenario X: A force of 100 N moves a box 12 m.Scenario Y: A force of 50 N moves a box 20 m.Scenario Z: A force of 25 N moves a box 45 m.

A
W and X
B
W and Z
C
X and Y
D
Y and Z
12

In which scenario is an animal doing work? Check all that apply.A cat lifts up her kitten by its neck.A dog rubs his back against a large tree.A bird flies a worm from the ground to its nest in a tree.A goat butts its head against the barn wall.A horse pulls a wagon along a road.

A
A cat lifts up her kitten by its neck.
B
A dog rubs his back against a large tree.
C
A bird flies a worm from the ground to its nest in a tree.
D
A goat butts its head against the barn wall.
E
A horse pulls a wagon along a road.
13

Kinetic energy and mass are proportional.

Answer not available
14

Four vehicles are traveling on the same road. Which vehicle most likely has the greatest kinetic energy?

A
a compact car traveling at a velocity of 10 m/s
B
a pickup truck traveling at a velocity of 25 m/s
C
a minivan traveling at a velocity of 10 m/s
D
a motorcycle traveling at a velocity of 25 m/s
15

Natalia lifts a bag of groceries 0.50 m by exerting a force of 36 N. How much work did she do on the bag?

A
0 J
B
18 J
C
36 J
D
72 J
16

A 60.0 kg runner is moving at 6.00 m/s and speeds up to 9.00 m/s. The runner’s change in kinetic energy is 1,350 J.How much work was done?

A
–2,430 J
B
–1,350 J
C
1,350 J
D
2,430 J
17

An object that is 0.5 m above the ground has the same amount of potential energy as a spring that is stretched 0.5 m. Each distance is then doubled.

A
The gravitational potential energy of the object will be two times greater than the elastic potential energy of the spring.
B
The elastic potential energy of the spring will be four times greater than the gravitational potential energy of the object.
C
The elastic potential energy of the spring will be two times greater than the gravitational potential energy of the object.
D
The potential energies will remain equal to one another.
18

The rate at which work is done is .

Answer not available
19

kinetic potentialgravitationalwork

A
kinetic
B
potential
C
gravitational
D
work
20

A load of bricks is lifted to the second floor of a building. How do work and power relate to this job?

A
The longer the job takes, the more work is done.
B
The faster the job is done, the greater the power.
C
The greater the power applied, the more work is done.
D
The less work is done, the more power is needed.

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