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These jacks work by using a two-piece mechanism – similar to those found on extending bathroom mirrors – in partnership with a self-locking central screw. Combined, these elements not only enable a vehicle to be lifted through the extension of the scissor mechanism, but also to be held in place by the resistive force of the screw, which without the jack would instantly collapse.

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This is the screw on top of a plastic water bottle. It uses a screw to tightly fasten the cap onto it to prevent leaks and to prevent impurities from entering.

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This is a military knife, it uses a wedge to cut ones enemies.

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This is an extension ladder. It uses a pulley system to extend extra sections of the ladder to make it longer, thus making it able to reach higher areas

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A flagpole works properly when a rope with the flag is passed through a pulley at the top of the pole. The trick is to ensure that the knot used to pass the rope through the pulley is easy to manipulate. This allows the flag to be unfurled correctly.

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this is a loading ramp which uses inclined plane to operate.It is tilted at an angle so that humans can use lesser effort to load goods onto the truck.

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this is a bicycle that uses the Wheel and Axel to operate.Its wheels are connected to an axle which allows it to rotate and move

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this is a fishing rod.Its reel is a good example of a 3rd class lever where the fish is the load,the effort is your hand and the handle of the pole is the fulcrum(pivot).

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this is a scissors. Scissors are a good example. The edge of the blades are wedges. But the blades are combined with a lever to make the two blades come together to cut things such as cloth.

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This is a axe. it uses a wedge to cut things. E.g. wood.

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This is a bottle opener. It uses a lever to amplify the force exerted on it.

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This is a hand-cranked drill. It uses bevel gears to turn the drill bit.

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Sec 1 Lesson 2 – Electronics