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Friction, Gravity and Machines

Machines are used to help us do things easier and faster.

a chain on a machine Machines are used to help us do things easier and faster. They help us do things that we could otherwise not do. Through mechanical advantage, they help us multiply our force and direct our energy to specific points. For instance, a hammer allows us to direct the force we apply to a very small specific area, the nail head.

Remember friction? You may remember that many machines must fight against friction - air friction and/or friction between moving parts. They must be designed specially to reduce friction, such as by using lubrication or smoother parts.

Friction

How do machines overcome friction?

By using lubrication.