A machine is a tool used to make work easier. Simple machines are simple tools used to make work easier. Compound machines have two or more simple machines working together to make work easier. Simple Machines affect the force or effort needed to do a certain amount of work. Machines help to make a tough job seem easier by enabling a person to apply less force or to apply force in a direction that is easier to manipulate. There are four types of simple machines: The lever, the pulley, the inclined plane , and the wheel and axle. Each machine affects the direction or the amount of effort needed to do work.

Grades  Activities & Simulations (click underlined simulations to view in below window)
4th - 8th Simple Machines – Lever ,  Inclined plane,  Pulley system – Single Pulley, Wheel and Axle,  Lever as Weighing Balance
8th-12th Inclined plane,  Pulley system – Single Pulley,  Pulley system – Movable Single Pulley,  Pulley system – 1Fixed + 1 Movable,  Pulley system – 2Fixed + 2Movable,

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