Identifying Types of Forces

Front

What is friction?

Back

Friction is a force that resists motion between two surfaces in contact.

Front

What is a noncontact force?

Back

A noncontact force is a force that can be applied without direct contact between objects.

Front

What is magnetic force?

Back

Magnetic force is a noncontact force that can attract or repel objects without touching them.

Front

What is a normal force?

Back

Normal force is the support force exerted upward by a surface against an object resting on it.

Front

What force keeps you from falling through your chair?

Back

The normal force from the chair acts upward against the force of gravity.

Front

What is gravitational force?

Back

Gravitational force is the attraction between two masses, such as the Earth and an object.

Front

What is applied force?

Back

Applied force is a force that is applied to an object by a person or another object.

Front

What is the difference between contact and noncontact forces?

Back

Contact forces require physical touch between objects, while noncontact forces act at a distance.

Front

Give an example of a contact force.

Back

Friction is an example of a contact force.

Front

Give an example of a noncontact force.

Back

Magnetic force is an example of a noncontact force.