which tasks can be done using lever
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A lever makes work easier by reducing the force needed to move a load. Work, in physics, is the product of the force used to lift a load multiplied by the distance the force, or effort, is applied. This relationship can be written mathematically as:
Work = Force ¥ Distance
The amount of work needed to move an object a given distance always remains the same except when friction is present. The lever, like all simple machines, makes doing work easier by reducing the force needed to move an object. In order to reduce the force needed, the distance over which the force is applied must be increased.
To increase this distance, the load to be moved must be close to the fulcrum and the force must be applied far from the fulcrum. A good example is a claw hammer used to pry nails loose. The user's hand applies force to the handle at one end of the lever. The head of the hammer is the fulcrum, and the nail at the other end of the lever is the load to be moved. The nail is much closer to the fulcrum than is the hand applying the force. Since the hand is farther away from the fulcrum, the force travels a greater distance than does the load as the nail is pried loose. The same amount of work would have been done if the nail had been pulled directly out by hand. However, by using the lever the force was spread out over a greater distance, and so less force was needed. Another example is a seesaw. The force of a smaller person can balance and even lift the load of a larger person as the smaller person moves farther away from the fulcrum.
The mechanical advantage (MA) of a lever tells how much the lever magnifies effort. The greater the MA, the less the effort needed to move a load. The MA of a lever is the ratio of the distance the force travels to the distance the load travels. In practical terms, the MA is the distance of the force to the fulcrum divided by the distance of the load to the fulcrum. Depending on the class of lever and the location of the fulcrum, the MA may be less than or greater than 1.
Work = Force ¥ Distance
The amount of work needed to move an object a given distance always remains the same except when friction is present. The lever, like all simple machines, makes doing work easier by reducing the force needed to move an object. In order to reduce the force needed, the distance over which the force is applied must be increased.
To increase this distance, the load to be moved must be close to the fulcrum and the force must be applied far from the fulcrum. A good example is a claw hammer used to pry nails loose. The user's hand applies force to the handle at one end of the lever. The head of the hammer is the fulcrum, and the nail at the other end of the lever is the load to be moved. The nail is much closer to the fulcrum than is the hand applying the force. Since the hand is farther away from the fulcrum, the force travels a greater distance than does the load as the nail is pried loose. The same amount of work would have been done if the nail had been pulled directly out by hand. However, by using the lever the force was spread out over a greater distance, and so less force was needed. Another example is a seesaw. The force of a smaller person can balance and even lift the load of a larger person as the smaller person moves farther away from the fulcrum.
The mechanical advantage (MA) of a lever tells how much the lever magnifies effort. The greater the MA, the less the effort needed to move a load. The MA of a lever is the ratio of the distance the force travels to the distance the load travels. In practical terms, the MA is the distance of the force to the fulcrum divided by the distance of the load to the fulcrum. Depending on the class of lever and the location of the fulcrum, the MA may be less than or greater than 1.
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Explanation:
A lever can be used to remove the cap of a soda bottle. It can be used to move heavy stone. Scissor is a type of lever used to cut papers and clothes. Plier is a type of lever that we use in cutting the wires.
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