Lesson 2: Potential Energy Answers

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1
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In which scenario is elastic potential energy present?

A
A bird sits in its nest in a tree.
B
A snake slithers through a leaf pile.
C
A dog sniffs at the base of a tree.
D
A fly stretches a spider web.
3

What must be true of an object that has gravitational potential energy?

A
It is stretched beyond a certain length.
B
It is above a reference point.
C
It is compressed shorter than a given length.
D
It is moving past a reference point.
4

A compressed spring has 16.2 J of elastic potential energy when it is compressed 0.30 m. What is the spring constant of the spring?

A
90 N/m
B
108 N/m
C
180 N/m
D
360 N/m
5

An eagle that has a mass of 4.5 kg is spotted 5 m above a lake. It flies up to its nest in a tree at a height of 25 m.

A
221 J
B
882 J
C
1103 J
D
1323 J
6

How does the work needed to lift an object and the gravitational potential energy of the object compare?

A
They are equal.
B
The work is greater.
C
The work is less.
D
The comparison depends on the height.
7

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
8

Which describes how the spring constant affects the potential energy of an object for a given displacement from an equilibrium position?

A
The higher the spring constant, the greater the gravitational potential energy.
B
The lower the spring constant, the greater the gravitational potential energy.
C
The higher the spring constant, the greater the elastic potential energy.
D
The lower the spring constant, the greater the elastic potential energy.
9

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
10

What is the best description of the energy stored in a stretched or compressed object?

A
gravitational potential
B
potential energy
C
elastic potential
D
spring constant
11

Doubling which quantity would cause the largest increase in a spring’s elastic potential energy?

A
displacement
B
spring constant
C
mass
D
gravitational acceleration
12

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.

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