Note Check: Friction

What is the definition of friction?

• the force that two surfaces exert on each other when they rub against each other

• a push or a pull

• a force that acts between objects that are not moving

• a force that occurs as an object moves through a fluid

What are the two factors that affect friction?

• type of surface

• how hard the surfaces are pushed together

• the mass of an object

• how close together the objects are

Smooth surfaces produce:

• more friction

• less friction

• no friction

Rough surfaces produce:

• more friction

• less friction

• no friction

Pushing two surfaces together harder creates:

• more friction

• less friction

• no friction

Friction acts in a direction ________ the direction of motion.

• opposite

• the same as

Friction that occurs when one solid surface slides over another is:

• sliding friction

• static friction

• fluid friction

• rolling friction

Friction that acts between objects that are not moving is:

• sliding friction

• static friction

• fluid friction

• rolling friction

Friction that occurs as an object moves through a fluid is?

• sliding friction

• static friction

• fluid friction

• rolling friction

Friction that occurs when an object rolls over a surface is:

• sliding friction

• static friction

• fluid friction

• rolling friction