Forces

Front

What is a force?

Back

A force is a push or pull that can change the motion of an object.

Front

What are contact forces?

Back

Contact forces are forces that occur when two objects are in physical contact with each other.

Front

What are noncontact forces?

Back

Noncontact forces are forces that act at a distance without physical contact, such as magnetism and gravity.

Front

What is magnetism?

Back

Magnetism is a force that can attract or repel certain materials, like iron, and is produced by magnets.

Front

What is gravity?

Back

Gravity is a force that pulls objects toward each other, such as the Earth pulling us down.

Front

What is friction?

Back

Friction is a force that opposes the motion of an object when it is in contact with another surface.

Front

What is a balanced force?

Back

Balanced forces are equal in size and opposite in direction, resulting in no change in motion.

Front

What is an unbalanced force?

Back

Unbalanced forces are not equal and can cause an object to start moving, stop moving, or change direction.

Front

What happens when more force is applied in the same direction?

Back

The motion of the object increases; it speeds up.

Front

What is a push force?

Back

A push force is a force that moves an object away from the source of the force.