Simple Machines
Where do you see simple machines in your life?
Goal:
Goal:
Pushing and pulling things on your own is hard work. Do not worry, though! There are lots of ways to help make moving things easier. These things are called simple machines. Click through the slides below to learn about each type of simple machine and how it is used to help people do work every day.
Pulley
Graphic of a pulley next to a flag pole. The diagram shows a wheel and rope being pulled to lift a box.
This is a pulley. Pulleys help lift heavy things, using a rope that loops over a wheel. A pulley is also what is used to raise a flag up a tall flagpole.
Lever
Graphic of a lever over a see-saw. The diagram shows a plank balanced on a triangle in the center with a large weight on one end.
This is a lever. A lever is a flat board or plank resting on another object called a fulcrum. The fulcrum lets the board move up and down like a seesaw. In fact, a seesaw is a lever! A lever is also useful for lifting something heavy. It can also be used for fun.
Wheel and Axle
Graphic of a wheel and axel next to a school bus. The diagram shows two wheels connected by long tube.
This is a wheel and axle. You probably know what a wheel is. Most wheels are connected to an axle that helps the wheel spin. You see wheels and axles all the time. Look at a car, bus, or bicycle. You will see a wheel and axle like this.
Wedge
Graphic of a wedge next to a door stop. The diagram shows a triangle axe in a piece of wood.
This is a wedge. A wedge is usually in the shape of a triangle. Wedges hold things together or push them apart. A doorstop is a wedge that keeps a door open, and an axe is a wedge used to split wood apart.
Inclined Plane
Graphic of an incline plane next to man in wheelchair going up a ramp. The diagram shows a rope pulling a box up a ramp.
This is an inclined plane. An inclined plane is a flat surface that is angled up. An inclined plane is useful for lots of things, especially when you need to get from a lower place to a higher place. Ramps are examples of inclined planes.
Screw
Graphic of a screw next to a light bulb. The diagram shows a screw being turned into a piece of wood.
This is a screw. It twists into place using ridges wrapped around a rod. It is something you might see around your house, like the lid of a jar or a lightbulb. The screw on the lightbulb keeps it in place. Screws are also useful for holding things together, like pieces of wood.
Question
What are the six simple machines?
The six simple machines are the lever, pulley, inclined plane, wedge, wheel and axle, and screw.