Friction

Front

What is friction?

Back

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

Front

What are the types of friction?

Back

The main types of friction are static friction, kinetic (or sliding) friction, and rolling 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

What is rolling friction?

Back

Rolling friction is the force that opposes the motion of a rolling object, like a wheel or ball.

Front

How does surface roughness affect friction?

Back

Rougher surfaces create more friction, while smoother surfaces create less friction.

Front

What is an example of helpful friction?

Back

Brakes on a bike, tires on a car, and the tread on shoes are examples of helpful friction.

Front

How does friction affect speed?

Back

More friction decreases speed, while less friction can increase speed.

Front

What happens to speed on a rough surface?

Back

The rougher the surface, the slower an object will travel over it.

Front

How can friction be reduced?

Back

Friction can be reduced by using lubricants like oil, reducing the force between surfaces, or smoothing the surfaces.