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a pen contain a spring .used for the contraction of the pen

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a bicycle uses a sprocket to turn the wheels

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a bicycle uses a gear .it is uses a gear to allow the rider to change speed

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a bicycle uses wheel axle . when you paddle turn the wheel

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A crane ia an example of the pully simple machine.A Pulley is a simple machine made up of a wheel and a rope. The rope fits into the wheel and one end of the rope is attatched to the load.

When you pull on one side of the pulley, the wheel turns and the load moves.

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A staircase is an example of the inclined plane simple machine. A spiral staircase, however, is categorized as a screw. Another common example is ramp.

Inclined planes are simple machines because they make it easier for heavy items to travel in an upward direction.

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Scissors are composed of two different types of simple machines: wedge and lever. The scissors' blades are sharpened into wedges, and the arms that are squeezed together are levers

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A knife is an example of a simple machine called a wedge. A wedge is made up of two inclined planes placed back to back to form a sharp edge. When the edge is placed between two objects and force is applied, the wedge drives the objects apart

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This is a spanner that is a screw things.it produces a large force when turned with a small force.

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This is a wedge.Which is a triangular shaped material used to split things apart

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This is a scissors that has a lever to help cut in a easier way.

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A ramp uses the simple machine in inclined plane which is easier to raise a heavy object by pushing or pulling it up an inclined plane than by lifting it straight up.Ancient Egyptians used inclined plane to help build the famous pyramids. By suren

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This bicycle contains a crank which uses the simple machine in wheel and axle which consists of an arm with one end connected to a rotating shaft,the other end having a handle which is the pedal in this case.it turns the chain when the pedals move up and down. -by suren

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This is a saw that the simple machine use is the wedge,a wedge is a piece of rectangular-shaped material used to push things apart.wedges can split rocks,rocks and logs. -by Suren

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Sec 1 Lesson 2 – Electronics