Machines are very important for us.They are everywhere and they help us making our lives easier.
Depending on how many parts they have, they can be simple or complex.
Machines can work with a force (pull push, turn, switch...) or with energy from batteries or electricity.
They are good for people but we need to be careful because they can be dangerous, too.
Some machines use the wind, the heat from the sun and the water to provide energy for people (renewable energies). They are also good for the environment)
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