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This is a toolbox and it is a linkage. two or more rods can be linked together to take movement from one place to another. A linkage is actually a combination of levers.

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This is a bicycle pedal and it is a crank. This consists of an arm with one end connected to a rotating shaft ( a short rod ), the other end having a handle which is the pedal in this case. it turns the chain ( that moves the wheels ) when the pedals move up and down.

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This is a bicycle chain and it is a sprocket.The bicycle chain is a toothed gear used with a chain.The teeth of the sprocket fit into the gaps in the chain. It is used to change the speed of the bicycle.

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This is a pair of scissors and it is a lever and a wedge. The scissors has 2 pieces of cutting blades. It is also a wedge because the scissors has a slight triangular shape and it can cut things apart. For example, paper or plastic.

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This is a window blind and it is a pulley. A pulley consists of a wheel with a groove along it's edge. A window blind has a rope along with it. By  pulling the rope on one side of the pulley, it raises the blinds. Since the blind is of light weight, it will be a convenience to use it and the speed will be faster.

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This is stairs and It is an inclined plane. It is a ramp which makes it easier to raise a heavy object by pushing or pulling it up an inclined plane than by lifting it straight up.

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This is a bottle cap and it is a screw. A screw consist of an inclined plane that is wrapped around it.  A bottle cap helps to secure the opening of the bottle, preventing particles from entering into the bottle.  It produces a large forces when you turn the bottle cap even with little force.

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This is a crane and it is a pulley. A pulley consists of a wheel with a rope looped along its edge. The pulley helps to make it possible for the crane to carry heavy loads without having putting additional  stress on the arms. The cables between the motor and the object that is being lifted is run through a series of cables and pulleys to minimize the amount of work needed to life the heavy load off the ground.

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This is a fishing rod and it is a lever. It has a rod that turns around a fixed point. Fishing rod is used by fishermen, pivoting the rod at the fulcrum and lift the rod near the middle so that the line at the other end will quickly lift the fish out of the water.

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This is the inner part of a correction tape. This correction tape has no teeth, but it has a rubber string joining the two wheels together, and this makes it a sprocket. The two wheels are then fitted into the correction tape and it controls the speed and amount of correction tape when used.

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This is a knife and it is a wedge. The blade is triangular and it is used to push things apart. This is a kitchen knife so it is used to cut up food.

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This is a escalator. Using the concept of an inclined plane, it is a ramp or slope and it is easier to raise people and objects to the next level. It is easier to raise them by pushing or pulling than by lifting it straight up.

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Sec 1 Lesson 2 – Electronics