Simple Machines

The contact between the object and the ground creates a force called _____.

Wheels and rollers turn easily and reduce the friction with the _____.

Because of the position of the ______, the force is increased.

a ____ has a fixed support point or culcrum and a rigid bar.

A ______ is a machine that uses wheels to lift an object.

Machines reduce the amount of ____ needed to carry out a task.

Friction forces work in the _____ direction of the movement.

an ______ _____ is a type of simple machine. It needs less effort to push a heavy object up a slope.

Machines give us a mechanical _______ because they reduce the amount of effort needed to carry out a task.

The most basic circular tool is a _______.

The ____ is the most important and earliest human invention.

a force _______ on one end of the bar is transferred to the other end.

A wheel has a circular part with a long rod or ____ going through the middle of it.