Phys Unit 7 -- Static Electricity

Question 1

Define Static Charge.

Answer 1

An electric charge that can be collected and held in one place.

Question 2

How many charges are there, and what are they? (remember, this is physics, not chemistry.)

Answer 2

Two. Positive and negative.

Question 3

True or false: there is no neutral charge unless it is the overall charge.

Answer 3

True. (unlike chem, there is no +2 or -2, just neutral.)

Question 4

What charge do protons hold? Electrons?

Answer 4

Protons are positive charge holders and electrons are negative charge holders.

Question 5

What condition must apply to call an object “neutral charge?”

Answer 5

The number of protons and electrons must be the same.

Question 6

What happens so that electric charge occurs?

Answer 6

The addition or removal of electrons.

Question 7

Determine if the following is true or false. If false, amend the statement so it is true.

1. Conductors do not allow electrons to flow easily.
2. Insulators allow electrons to move freely.

Answer 7

False.
Answer:
1. Conductors allow electrons to flow easily.
2. Insulators do not allow electrons to move freely.

Question 8

Name an example for a conductor.

Answer 8

Metals.

Question 9

Name three examples of non-conductors.

Answer 9

Glass, plastic, ceramics.

Question 10

How do objects become charged? Give an example.

Answer 10

Objects become charged by friction. Example: rubbing feet on the carpet.

Question 11

Give the unit of the electrical charge and its letter.

Answer 11

Coulomb (C)

Question 12

Which series helps you find out the tendency of losing or gaining electrons?

Answer 12

The triboelectric series.

Question 13

Determine the charges for each item using the Triboelectric Series.

A balloon is rubbed with a paper towel. What is the charge of…

a) the balloon
b) the paper towel.

Answer 13

a) the balloon’s charge will be negative

b) the paper towel’s charge will be positive.

Question 14

What instrument can generate static charge?

Answer 14

Van de Graaff Generator.

Question 15

Where is the static charge produced on the Van de Graaff Generator?

Answer 15

The conveyor belt.

Question 16

Define grounding.

Answer 16

Grounding allows charge to flow into the earth’s surface.

Question 17

True or false: electrical appliances can be grounded by connecting a wire to the metal frame.

Answer 17

True.

Question 18

What is electric force?

Answer 18

it is a push or pull.

Question 19

On what two things does the electric force depend on?

Answer 19

1. Distance between objects.

2. Amount of charge. (more is stronger, less is weaker.)

Question 20

Name the three laws of static charge.

Answer 20

1. Opposites attract.
2. Like charges repel.
3. Neutral objects are attracted to charged objects.

Question 21

Define conduction:

Answer 21

Conduction is the process of transferring charge between objects by touching. (think of conductivity.)

Question 22

Define induction:

Answer 22

Induction is the process of rearranging the electrons on a neutral object by bringing a charged object close to it.

Question 23

Which law of static charge applies to induction?

Answer 23

Law 3: neutral objects are attracted to charged objects.

Question 24

True or false: conduction needs contact and induction does not, but the result stays the same.

Answer 24

True.