Types of Forces

Types of Forces

Contact forces: These require physical

contact between objects.

Friction

Applied Forces

Normal Forces

Multiple Choice

Two object must touch each other for a contact force to have happened

• yes

• no

Friction

• Friction is a force that slows motion when two objects

rub against each other

• Friction opposes motion

Multiple Choice

Friction ______ Motion.

• helps motion

• opposes (slows) motion

●rubbing both the hands
together to create heat

●a child sliding down through a
slide in a park

●a book sliding across a table

●a book resting on a table

●a car parked on a hill

●a ladder leaning against a
wall

●A moving car

●rolling a soccer or tennis ball

●a marble rolling on the floor

Open Ended

Give one example of friction

Applied Force

A force that is applied to an object by

another object or person

• when you push a door open

• kick a ball

• pull a drawer out

Multiple Choice

An example of applied force is _______.

• rain falling

• earth orbiting

• kicking a ball

Normal Forces

Upward push of a surface on an object

that keeps the object from falling through.

● Books sitting on a table

● A person sitting on a tabletop

Multiple Choice

Normal forces

• make objects fly

• keep objects from falling through surfaces

• give objects speed

Open Ended

Give and example of a normal force.

Non-contact forces: These act on objects
even if they are not physically touching.

Gravity

Magnetism

Magnetic Force

Attraction or repulsion between

magnetic poles.

• Magnet on a refrigerator
• MRI Machine
• A compass

Multiple Choice

When a magnet pulls a paper clip toward it, that is a _______ force.

• applied

• normal

• magnetic

Gravitational Force

The attraction between two objects

with mass, such as Earth pulling objects

toward its center.

● Rain falling to Earth
● Tides in the ocean

● Earth’s revolution around the sun