We explain what a lever is, the forces it uses and the variables to consider. In addition, Its types and examples.
By lever we refer to a simple machine, that is, to a device capable of modifying or generating a force and transmitting displacement , composed of a rigid bar of some moderately resistant material, which rotates freely on a fulcrum called fulcrum.
It can be used to maximize the mechanical force applied to an object, increase its speed or the distance it travels, by applying a proportionately smaller amount of force.
Thus, depending on the proximity or distance of the fulcrum with respect to the body to be moved, more or less applied force will be required and a greater or lesser effect will be achieved.
Three forces act simultaneously on a lever:
In turn, there are two other variables to consider in the case:
All of the above is related through the following formula:
P x Bp = R x Br , the power on his arm is equal to the resistance on his.
The lever was invented in human prehistory , and there are records already in Mesopotamian antiquity of its use for irrigation crankshafts. The first written mention of a lever comes from Pappus of Alexandria in his Mathematical Collection (340), where the famous quotation of the Greek Archimedes appears: “Give me a lever and I will move into the world.”
There are three types of lever, depending on the relative position of the resistance point, the power point and the fulcrum. Each has different characteristics and will have a relatively different effect.
Some everyday examples of lever can be:
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