AnswersTX-Integrated Physics and Chemistry B-CRUnit Test

Energy Transformations Answers

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Let's consider a scenario of a roller coaster ride. As the roller coaster at the top begins to descend, it loses height, which means its potential energy decreases and kinetic energy starts increasing and reaches its maximum value.By using the above scenario, which statement best compares potential and kinetic energy?

A
Objects always have more potential energy than kinetic energy.
B
Kinetic energy increases and potential energy decreases when the velocity of an object increases.
C
Only potential energy decreases when an object’s height increases.
D
Objects always have more kinetic energy than potential energy.
2
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The diagram shows a ball resting at the top of a hill.

Question illustration
A
The potential energy in the system is greatest at X.
B
The kinetic energy in the system is greatest at X.
C
Total energy in the system decreases as the ball moves from X to Y.
D
Total energy in the system increases as the ball moves from X to Y.
3

The diagram shows a person holding a bow and arrow.

Question illustration
A
pulling farther back on the string
B
releasing the string
C
holding the arrow higher
D
decreasing the mass of the arrow
4

The table shows information about four objects resting at the top of a hill. Which object is on the tallest hill?

Question illustration
A
W
B
X
C
Y
D
Z
5

This diagram shows a baseball’s motion.

Question illustration
A
Kinetic energy becomes potential energy between points R and S.
B
Maximum potential energy is at point P.
C
Maximum potential energy is at point R.
D
Potential energy becomes kinetic energy between points P and Q.
6

A car is moving at 12 m/s and has a mass of 600 kg. What is the kinetic energy of the car? (Formula: )

Question illustration
A
36,300 J
B
43,200 J
C
72,600 J
D
86,400 J
7

What is the kinetic energy of a ball with a mass of 0.5 kg and a velocity of 10 m/s? (Formula:)

Question illustration
A
25 J
B
5 J
C
50 J
D
100 J
8

A sled is at rest at the top of a slope 2 m high. The sled has a mass of 45 kg. What is the sled’s potential energy? (Formula: PE = mgh)

A
90 J
B
56.8 J
C
441 J
D
882 J
9

Which two factors are used to calculate the kinetic energy of an object?

A
gravity and velocity
B
velocity and mass
C
mass and volume
D
volume and height
10

A soccer ball is traveling at a velocity of 50 m/s. The kinetic energy of the ball is 500 J. What is the mass of the soccer ball? (Formula: )

Question illustration
A
0.1 kg
B
0.2 kg
C
0.4 kg
D
0.5 kg

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