Static/Kinetic 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 when a force is applied.

Front

What is kinetic friction?

Back

Kinetic friction is the force that opposes the motion of two surfaces sliding past each other.

Front

How does static friction compare to kinetic friction?

Back

Static friction is generally greater than kinetic friction for the same surfaces.

Front

What factors affect the amount of friction between two surfaces?

Back

The type of surface and the normal force acting between the surfaces.

Front

What is the normal force?

Back

The normal force is the perpendicular force exerted by a surface on an object in contact with it.

Front

What is the coefficient of friction?

Back

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

Front

What is the formula for calculating static friction?

Back

Static friction (Fs) = coefficient of static friction (μs) × normal force (N).

Front

What is the formula for calculating kinetic friction?

Back

Kinetic friction (Fk) = coefficient of kinetic friction (μk) × normal force (N).

Front

What happens to the frictional force when the surface area of contact increases?

Back

The frictional force does not significantly change with an increase in surface area; it primarily depends on the normal force and the type of surfaces.

Front

In which direction does friction act?

Back

Friction always acts in the opposite direction to the applied force or the direction of motion.