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Unit 11. Objects and machines
How do machines work?
Computers
webcam
printer
mousekeyboard
CPU
Be careful and safe energy
Never use machines near water
Never try to open a machine if it is
plugged in.
Never plug in a machine if
your hands are wet.
Never plug in too many
machines at the same
time.
Parts of objects
Forces: push and pull
Forces: push and pull

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Unit 11. Objects and machines