Definition:

Simple machines are machines which makes our work easier, by changing the amount of force we use to move something, or to change the amount of effort we give to do something.

How it helps (with examples)

They do not have many moving parts. But not all simple machines are made of few parts, for example, scissor's only use two levers and two wedges, but on the other hand a can opener has combined wedges, wheels and axle, and lever. They help us do things like lifting, pushing, or pulling objects with less effort. For example, using a ramp to move a heavy box is easier than lifting it straight up.

Who invented simple machines?

Simple machines were not invented by one person. Because people have used them since ancient times, even before the history we know.

But here are some important names:

• Archimedes (around 250 BCE)— A famous Greek scientist who studied about levers, pulleys, and screws. He explained how they work and helped people understand the science behind them.

• Ancient Egyptian— Ancient Egyptians used simple machines like ramps, and levers, to build the pyramid.

• Greek philosophers— studied and wrote about simple machines like the wedge and wheel.

What does work mean in this topic?

Work is done, when you use force to move an object.

For example:

• Lifting a box with a pulley

• Rolling a cart up a ramp

• Pushing a nail into wood with a hammer

Formula for work:

Work = Force × Distance