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LEVER A lever is a simple device for changing the size of a force. It is made up of a rigid length and a fulcrum. It is generally grouped into three different classes: scissors, nutcrackers and tweezers.
WHEEL & AXLE The wheel and axle is a simple machine that consists of a circular object (the wheel) that rotates around a central shaft (the axle). The wheel and axle work together to provide mechanical advantage. Examples of the wheel and axle can be found in everyday objects like cars, bikes, and even doorknobs.
SCREW A screw is an axle with a sloped spiral track called a thread. The thread converts rotary motion to linear motion. It works with a gear to turn the direction of rotation through 90º.
PULLEY A pulley is a simple machine that makes light work of carrying loads. Two or more pulleys put together are called block and tackle.
