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This knife is cutting a melon. It is a wedge. A wedge is a pair of inclined planes that move.
This is a rope attached to a bucket. It is used to release the bucket into the well. This simple machine is a pulley. A pulley is a simple machine that has a grooved wheel that holds rope or cable!
A doorknob is a simple machine. If you turn it, it will open something or turn it on. It is a wheel and axel. Wheel and axels are simple machines consisting of two circular objects of different sizes.
This dog walked up an incline plane. An incline plane is a simple machine that is a straight, slanted surface. Like this ramp.
The oars are a type of lever. A lever is a simple machine that has a bar that pivots at a fixed point. Levers are used to apply a force to a load. The oars are applying a force on the water wich is moving the boat.
This is a screw. This simple machine is an inclined plane that is wrapped in a spiral around a cylinder.
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