Pretest Answers

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1
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How does an object become negatively charged?

A
It loses electrons.
B
It loses protons.
C
It gains electrons.
D
It gains protons.
3

A small, positively charged ball is moved close to a large, positively charged ball. Which describes how the small ball likely responds when it is released?

A
It will move away from the large ball because like charges repel.
B
It will move toward the large ball because like charges repel.
C
It will move toward the large ball because like charges attract.
D
It will move away from the large ball because like charges attract.
4

Which change increases the electric force between objects?

A
Electrons are added to two negatively charged objects.
B
Two neutral objects are moved closer together.
C
The charge on two positively charged objects is reduced.
D
Two oppositely charged objects are moved farther apart.
5

Which factors affect the strength of the electric force between two objects?

A
the mass of the objects and the amount of charge on the objects
B
the amount of charge on the objects and the type of charge on the objects
C
the distance between the objects and the amount of charge on the objects
D
the mass of the objects and the distance between the objects
6

Hiro rubs an inflated balloon on his hair, and his hair sticks to the balloon. As he moves the balloon away from his head, how does the electric force change?

A
The electric force increases because the balloon loses its charge.
B
The electric force increases because the distance increases.
C
The electric force decreases because the distance increases.
D
The electric force decreases because his hair loses its charge.
7

How does increasing the amount of charge on an object affect the electric force it exerts on another charged object?

A
The electric force decreases because the amount of charge has an indirect relationship to the force.
B
The electric force increases because the amount of charge has an indirect relationship to the force.
C
The electric force increases because the amount of charge has a direct relationship to the force.
D
The electric force decreases because the amount of charge has a direct relationship to the force.
8

Shareen performs a skit to model a method of charging. In the skit, a painter shakes her hand and gets paint on her. How does the skit model a method of charging?

A
It models conduction because the painter represents a neutral object and the paint represents electrons that are transferred through rubbing.
B
It models induction because the painter represents a charged object and the paint represents electrons that are transferred through contact.
C
It models induction because the painter represents a neutral object and the paint represents electrons that are transferred through rubbing.
D
It models conduction because the painter represents a charged object and the paint represents electrons that are transferred through contact.
9

An electroscope is a device that detects charge on objects that touch it or are brought near it. John rubs a piece of cotton fabric on a plastic rod and then touches the rod to the electroscope. What methods of charging does John use?

A
John charges the rod through conduction, then charges the electroscope through induction.
B
John charges the rod through friction, then charges the electroscope through conduction.
C
John charges the rod through induction, then charges the electroscope through friction.
D
John charges the rod through friction, then charges the electroscope through induction.
10

A plastic rod becomes negatively charged when it is rubbed with a piece of wool. How does the rod become charged?

A
Protons move from the rod to the wool.
B
Protons move from the wool to the rod.
C
Electrons move from the rod to the wool.
D
Electrons move from the wool to the rod.

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