For a scavenger hunt, you can find the following examples of simple machines around your home:
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Lever: A seesaw or a pair of scissors can serve as levers.
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Pulley: A curtain rod with curtains or a clothesline with pulleys is a great example.
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Inclined Plane: A ramp for wheeling in groceries or a slide in a playground.
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Screw: A jar lid or a wood screw used in furniture assembly.
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Wedge: A knife or an axe can be used as wedges.
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Wheel and Axle: A rolling office chair or a bicycle wheel.