Answer:
A see-saw provides good fun. Although you might not think so your knives, forks and spoons are levers. You have the brake and gear change levers on a cycle. You might not be aware that there are three basic types of levers. Many switches are levers. Your own body has quite a few "bone" levers. When you flick a small ball of paper by using your ruler you are using a lever. You use a lever called a spoon to stir with. A bedroom door is a lever, as are most hinged things.
Increasing force by mechanical advantage.
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Mechanical advantage = distance moved by input / distance moved by output
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Output force = input force * mechanical advantage
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Force * distance = work done
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(Input) force * distance = (Output) force * distance