(They are important because) they help us save a lot of time and energy
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What can a hair dryer do for us?
It helps us dry our hair when it's wet.
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What can a washing machine do for us?
It helps us wash our dirty clothes
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What do we use a lift for?
We use it to get from the bottom to the top of a building.
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What do we use a vacuum cleaner for?
We use it to clean dirty floors in our homes.
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What do we use a camera for?
We use it for taking photos
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What are the differences between complex machines and simple machines?
Complex machines have lots of different parts and most of them need electricity to wok. Simple machines only have a few parts and we need to use our energy to..