Simple machine intro

ForceA push or pull that can change the way

something moves

Simple Machine

A tool that uses force to make work easier.

Inclined planeA simple machine with a flat surface whose endpoints are at different

heights.

effortThe total Work

done to achieve an outcome

LeverA stiff bar that moves freely around a

fixed point.

fulcrumThe pivot point

Class one lever

when the fulcrum is flanked by the effort and the load

Class Two lever

the load in the middle of the fulcrum and the effort

Class three lever

the effort lies between the load and fulcrum

wedgetwo inclined planes in a v-

shape

Outward force

Push outward

Downward force

Push down

screw

An inclined plane wrapped around a column

shaft

The long part of the screw

head

The top of the screw

pulley

A rope fitted around the rim of a fixed wheel.

Fixed pulley

The wheel does not move, making the effort force change direction

Moveable pulley

This type of pulley increases the force’s size. By pulling a rope, both the load and the pulley

raise

Wheel and axle

Two cylinders that turn on the same axis

friction

A force that slows or stops motion between two surfaces that are

touching

Compound machine

A machine made up of two or more

simple machines