Forces and Simple Machines

A (a)   is a push or a pull.

(a)   is the force that pull all objects toward the earth.

The force applied to cause a simple machine to do work is called _______________.

• the load

• the effort

• fulcrum

• friction

A change in position is called _________ .

• motion

• friction

• force

• gravity

The force that resists the movement of objects against each other is called ________ .

• motion

• friction

• force

• gravity

The weight of the object being moved is called (a)   .

On lever, the point on which a bar turns is called (a)   .

In the group of simple machines, this picture belongs to_________________.

• wheels and axles

• screw

• inclined plane

• pulley

In the group of simple machines, this picture belongs to _________________.

• wheels and axles

• screw

• inclined plane

• pulley

In the group of simple machines, this picture belongs to _________________.

• wedge

• screw

• lever

• inclined plane