Friction and Gravity

The force two surfaces exert when rubbed against each other is called

• motion

• gravity

• friction

• pressure

In which direction does friction act?

• In the same direction as motion

• In the opposite direction of motion

Friction is affected by which factor(s)?

• only the type of surface (smooth vs. bumpy)

• only how hard the surfaces are pushed together

• both the type of surface and how hard they are pushed together

Fluids flow.  Choose the one state of matter that is NOT considered a fluid, since it doesn't flow.

• gas

• liquid

• solid

Which is a type of friction?

• rolling friction

• sliding friction

• fluid friction

• static friction

• all of these are types of friction

Gravity is a ____ force.

• PULLING

• PUSHING

You have gravity, and so does your pencil.

• TRUE

• FALSE

The more massive an object is,

• the more gravity it has, so it pulls harder on other objects.

• the less gravity it has, so it does not pull as hard on other objects.

The closer two objects are

• the weaker the gravitational force between them.

• the stronger the gravitational force between them.

The amount of matter in an object (amount of stuff that makes it up) is called its

• weight

• volume

• mass