Unit 5 Review

A balloon has a negative charge. A glass rod has a positive charge. What will happen when the glass rod is brought near the balloon?

• The balloon will be attracted to the rod.

• The balloon will be repelled by the rod.

• The balloon will remain in place.

• The balloon will spin in circles.

Two oppositely charged particles are held in place near each other. When the particles are released, they will most likely

• accelerate away from each other.

• accelerate toward each other.

• rotate in a clockwise direction.

• rotate in a counterclockwise direction.

Static electricity happens when electrons pass from one object to another, such as from your hair to a comb as you comb your hair. If you then hold the comb near your hair, strands of hair appear to move forward and "stick to the comb." The hair and the comb

• attract each other because they have the same charges.

• attract each other because they have opposite charges.

• repel each other because they have the same charges.

• repel each other because they have opposite charges.

Which of the following describes an object that must have a net negative charge?

• It contains more molecules than atoms.

• It contains more electrons than protons.

• It is carrying an electric current.

• It is made of metal.

Two oppositely charged objects are separated by a small distance. The objects are then moved three times farther apart from each other. Which of the following statements best describes what happens to the electrical force between the objects?

• The force of attraction increases.

• The force of attraction decreases.

• The force of attraction becomes zero.

• The force of attraction stays the same.

A balloon is rubbed against a sweater. Which of the following occurs because of the rubbing?

• destruction of charged particles on the balloon

• release of charged particles from the air in the balloon

• movement of negatively charged particles from one material to the other

• movement of positively charged particles from one material to the other

Which of the following conditions results in the buildup of static charge on an object?

• when neutrons outnumber electrons

• when there are more protons than neutrons

• when there are more electrons than protons

• when all neutrons have been removed from the object

A neutral balloon is rubbed with a piece of wool cloth. As a result, the balloon has a negative static charge. Which of the following statements best explains why the balloon has a negative charge?

• The balloon is a conductor.

• The balloon is an insulator.

• The balloon transfers charges to the cloth.

• The balloon receives charges from the cloth.

What happens when electrical charges are brought together?

• Unlike charges attract and like charges repel.

• Unlike and like charges attract.

• Like charges attract and unlike charges repel.

• Like charges attract and repel.

Which best describes a parallel circuit?

• Electricity flows along one pathway.

• The flow of electricity comes from one source.

• Electricity flows along more than one pathway.

• The flow of electricity comes from more than one source.