Friction Review

Front

What are the units on the force due to friction?

Back

Newtons

Front

What are the units on the coefficient of friction?

Back

none

Front

Normal force is:

Back

Always perpendicular to the surface.

Front

A box takes 40 N to start moving when the coefficient of static friction is .54. What is the weight of the box?

Back

74 N

Front

If you are applying a horizontal force of 100 N to an object, what is the force of friction when the object does not move?

Back

100 N

Front

What is friction?

Back

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

Front

What is static friction?

Back

The frictional force that prevents two surfaces from sliding past each other.

Front

What is kinetic friction?

Back

The frictional force acting between moving surfaces.

Front

What factors affect the force of friction?

Back

Surface roughness, normal force, and the materials in contact.

Front

What is the coefficient of friction?

Back

A dimensionless number that represents the ratio of the force of friction between two bodies and the force pressing them together.