Friction Static

What is static friction?

• Friction between two surfaces that are moving along side each other.

• Friction between two stationary surfaces or object at rest.

• Friction between any two surfaces.

• Friction that occurs when an object rolls over a surface

Why does static friction exist?

• Because surface have imperfections and adhesion occurs between the two stationary surfaces.

• Because surfaces have imperfections, but adhesion doesn't occur between two stationary surfaces.

• Because surfaces are smoother when you move an object.

• Because surfaces are smoother before you move an object.

Static friction prevents motion between surfaces in contact.

• True

• False

A block sitting on the side of a ramp is an example of what type of friction?

• Dry friciton

• Rolling friction

• Fluid friction

• Static friction

Static friction is always larger than kinetic friction?

• True

• False