Gravity and friction

Friction is a force that opposes_______________

To push a heavy crate across a floor, you must first overcome_______________  friction, which tends to hold it in place

After overcoming that form of friction, you must push against_________________  friction

Friction between a surface and air or a liquid is called______________- friction.

Air friction on a car or airplane is also called air____________________.

Friction between solid surfaces is caused mostly by roughness on a(n)_________________- scale.

Friction can also be caused by _____________________-attraction between particles

Friction between solid surfaces can be reduced with______________-

An object that has twice as much mass as another weighs four times as much.

• True

• False

• You

• Felve

Near Earth’s surface, the weight of an object in newtons is about 10 times its mass in kilograms.

• True

• False

• You

• Felve