A lever is simply a bar oscillating about an axis or fulcrum . If you apply a force that pushes or pulls on a lever point, the rocks on the fulcrum exert useful actions on another point. the applied force, called power (counterweight) can lift a weight , or overcome a resistance . Both are called load.
There are basically 3 types of lever:
Lever grade:
has the fulcrum between the load and the force that is exerted from the opposite end. This type of levers are subdivided into
has the fulcrum between the load and the force that is exerted from the opposite end. This type of levers are subdivided into
lever with fulcrum in the center:
load and counterweight are equidistant from the fulcrum. Here, two forces are equal and both ends with the same intensity range to find the balance.
lever with offset fulcrum:
load and counterweight are equidistant from the fulcrum. Here, two forces are equal and both ends with the same intensity range to find the balance.
lever with offset fulcrum: The counterweight is twice as far from the fulcrum than the load. Although the counter only half the weight, exercising twice as hard to load.
Examples of levers
1st Grade:
Examples of levers
1st Grade:
Levers 2nd Grade:
Point Support is at one end of the bar and the force is applied from an opposite end. The load must travel is between the fulcrum and elextremo to be lifted. Examples
lever pa 2nd Grade:
lever pa 2nd Grade:
Levers 3rd Grade:
In this case, the fulcrum is also at one end of the lever, but the position of the load and the forces are in reverse positions.
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