DC -- friction

The force of friction between two surfaces is _______ the relative motion between the two surfaces.

• perpendicular to

• the same direction as

• opposite to

If two surfaces are in contact and moving relative to one another, then the friction between them is called

• air resistance

• kinetic friction

• static friction

• molecular friction

Static friction acts upon objects that are ----

• stationary

• moving

• not in contact

• magnetic

Which is greater?

• static friction

• kinetic friction

What is u_s in this equation?

• the direction of static friction

• the normal force

• the friction force

• coefficient of static friction

The direction of friction is ________ the normal force.

• in the same direction as

• opposite to

• parallel to

• perpendicular to

What is the range of values for the coefficient of friction?

• 0 - 100

• 0.1 - 0.5

• 0 - 10

• 0 - 1

Which type of friction was NOT shown on the first page of the reading assignment?

• air friction

• rolling friction

• sliding friction

• viscous friction

• component friction

Comes from liquids being displaced or forced to flow around or through objects.

• viscous friction

• air friction

• sliding friction

• rolling friction