Friction Flashcard

Front

What is friction?

Back

Friction is the force that opposes the relative motion of two surfaces in contact.

Front

What are the two main types of friction?

Back

Static friction and kinetic (or dynamic) friction.

Front

How does surface roughness affect friction?

Back

The roughness of a surface increases the force of 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 the normal force?

Back

The normal force is the force exerted by a surface that supports the weight of an object resting on it.

Front

What is the relationship between normal force and frictional force?

Back

Frictional force is proportional to the normal force; as the normal force increases, the frictional force also increases.

Front

What is the coefficient of friction?

Back

The coefficient of friction is a dimensionless value that represents the ratio of the force of friction between two bodies and the normal force pressing them together.

Front

What is the formula for calculating the coefficient of static friction?

Back

Coefficient of static friction (μs) = Frictional force (Ff) / Normal force (Fn).

Front

What is the difference between static and kinetic friction?

Back

Static friction occurs when an object is at rest, while kinetic friction occurs when an object is in motion.