Fourth Grade
Worksheets
Simple Machines: The Wheel and Axle
Simple machines make it easier for us to do work. A wheel and axle is one of the six simple machines. The wheel and axle work together to make one simple machine. A round water faucet knob is one example of a wheel and axle. The round knob is the wheel. Under the knob is a thin shaft. The knob is connected to the shaft. The shaft turns the water on and off. The shaft is the axle. The thin shaft would be hard to turn with your hands. The knob is larger. It is easy to turn with your hand. When you turn the knob, it also turns the shaft. The water is easy to turn off and on, thanks to a wheel and axle! There are many objects that use wheels and axles. A car uses many wheels and axles. .....
