Friction Review

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 are the two main types of friction?

Back

The two main types of friction are static friction (the force that keeps an object at rest) and kinetic friction (the force acting on an object in motion).

Front

What is the coefficient of friction?

Back

The coefficient of friction is a numerical value that represents the amount of frictional force between two surfaces in contact.

Front

How does surface roughness affect friction?

Back

Rougher surfaces generally have higher friction because they have more irregularities that interlock.

Front

What happens to an object's speed in the absence of friction?

Back

In the absence of friction, an object in motion will continue to move at a constant speed indefinitely.

Front

What is the direction of the force of friction?

Back

The force of friction always acts in the opposite direction to the direction of motion.

Front

What is static friction?

Back

Static friction is the force that must be overcome to start moving an object at rest.

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 an example of friction in everyday life?

Back

An example of friction is when you rub your hands together to create warmth.