Unit 4 - Friction 2

Front

What is static friction?

Back

Static friction is the force that keeps an object at rest and prevents it from starting to move. It acts in the opposite direction of the applied force until it reaches its maximum value.

Front

What is kinetic friction?

Back

Kinetic friction is the force that opposes the motion of an object that is already moving. It is generally less than the maximum static friction.

Front

What happens to the speed of a moving object when a force less than kinetic friction is applied?

Back

The object will slow down because the applied force is not enough to overcome the kinetic friction.

Front

What happens to the speed of a moving object when a force greater than kinetic friction is applied?

Back

The object will speed up in the direction of the applied force.

Front

How does adding weight to an object affect static and kinetic friction?

Back

Adding weight increases both the maximum static friction and the kinetic friction.

Front

What is the maximum static friction for an object?

Back

The maximum static friction is the highest force of static friction that can be applied before the object starts to move.

Front

If an object is not moving and a force is applied, what determines the frictional force?

Back

The frictional force will equal the applied force up to the maximum static friction limit.

Front

What is the relationship between normal force and friction?

Back

Frictional force is directly proportional to the normal force acting on an object. More normal force results in more friction.

Front

What is the formula for calculating frictional force?

Back

Frictional force (f) = coefficient of friction (μ) × normal force (N).

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 force pressing them together.