Friction

Front

What is friction?

Back

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

Front

What happens to a marble traveling without friction?

Back

The marble would remain at constant speed.

Front

What are examples of lubricants?

Back

Oil, grease, and powder are all examples of lubricants.

Front

What is a contact force?

Back

A contact force is a force that occurs when objects are physically touching each other.

Front

What force acts in the opposite direction of motion when two surfaces touch?

Back

Friction.

Front

What effect do rough surfaces have on friction?

Back

Rougher surfaces have greater friction.

Front

What is static friction?

Back

Static friction is the force that keeps an object at rest and prevents it from starting to move.

Front

What is kinetic friction?

Back

Kinetic friction is the force that opposes the motion of an object that is already moving.

Front

How can friction be reduced?

Back

Friction can be reduced by using lubricants, smoothing surfaces, or using wheels.

Front

What is the role of lubricants?

Back

Lubricants reduce friction between surfaces in contact.