Unit 7 machines simple
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Transcript of Unit 7 machines simple
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Machines and inventions
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A machine is an instrument that makes work easier.
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Simple machines and complex machines
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Simple machines often have one or two parts.
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Complex machines have more than two parts.
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Sometimes they are a combination of different machines.
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- burn fuel
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The printing press.
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Made from animal skins
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The invention of the printing press meant that many books could be made at the same time.
It was the information revolution.
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We read printing books and we also read electronic books.
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Was invented about 250 years ago.
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People built railways to connect cities in European countries and in the US.
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Machines help us in different ways.
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Workers need to follow special safety rules.
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Electricity flows through metals, water, trees and people.
These materials are conductors.
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Plastic, glass and rubber, block the flow of electricity.
They are insulators.
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