{Science 9} Static Charge & Electric Force 7.1 & 7.2

Front 1

Static electricity is also known as _________________. This refers to the build-up of electric charge in one place.

Back 1

static charge

Front 2

All matter is made up of tiny particles called _____________.

Back 2

atoms

Front 3

The positively charged ______________ is the centre of the atom. It consists of positively charged subatomic particles called _______________ and subatomic particles with no charge called ______________.

Back 3

nucleus
protons
neutrons

Front 4

The negatively charged subatomic particles called _____________ occupy the area around the nucleus.

Back 4

electrons

Front 5

An object is uncharged or ______________ when the number of positives charges equals the number of negative charges.

Back 5

neutral

Front 6

If an atom loses an electron, it has more protons than electrons. The atom will have an overall ____________ charge.

Back 6

positive

Front 7

If an atom gains an electron, it has more electrons than protons. The atom will have an overall _____________ charge.

Back 7

negative

Front 8

Glass and acetate are examples of ____________ because they do not allow electrons to move easily through them.

Back 8

insulators

Front 9

Metals like copper and aluminum are good __________________ because they allow electrons to move freely through them.

Back 9

conductors

Front 10

The ______________ is a unit of electric charge.

Back 10

Coulomb

Front 11

Scientists use a ____________________ to create static charge.

Back 11

Van de Graaff generator

Front 12

Lightning rods on top of buildings allow static charges from lightning to flow into Earth's surface. This is know as:

Back 12

grounding

Front 13

A scale shows what materials are more likely to lose and gain electrons. The left side has the tendency to lose electrons and become positive: __________, __________, __________, _________.

Back 13

glass
human hair
wool
cat's fur

Front 14

The middle is inbetween: ______, _____, ________.

Back 14

silk
cotton
paper

Front 15

The right side has the tendency to gain electrons and become negative: __________, ____________, _________, _________,

Back 15

balloon
vinyl
plastic
rubber

Front 16

A neutral object has the exact same number of:

Back 16

protons and electrons

Front 17

What are the laws of static charge?

Back 17

Objects with the same charge repel each other.
Objects with opposite charges attract each other.
Charged objects attract neutral objects.

Front 18

An ________________ is a push or pull between charged objects.

Back 18

electric force

Front 19

The ____________________________ state that like charges ___________ and opposite charges ___________.

Back 19

laws of static charge
repel
attract

Front 20

The electric force that acts on any pair of objects depends on the ______________ and ____________________ on the objects and on the _____________________.

Back 20

type of charge
amount of charge
distance between objects

Front 21

If you increase the amount of charge on objects, you _______________ the electric force. If you ____________ the distance between objects you decrease the electric force.

Back 21

increase
increase

Front 22

A device that can predict the presence of charge is the __________________.

Back 22

electroscope

Front 23

If the leaves of an electroscope become charged, they will ______________ each other.

Back 23

repel

Front 24

Charging by ____________ occurs when objects touch and an electric charge is transferred from one object to the other.

Back 24

conduction

Front 25

Charging by ____________ occurs when objects are charged without touching.

Back 25

induction

Front 26

Neutral objects are attracted to charged objects they are charged by _________

Back 26

induction