ARMS OF LEVER Meaning and
Definition
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The "arms of lever" is a term used in physics and mechanics to describe a fundamental concept related to the functioning of a lever. A lever is a simple machine consisting of a rigid body that pivots around a fixed point, called the fulcrum, to transmit and increase the mechanical force applied. The "arms of lever" refer to the two perpendicular distances measured from the fulcrum to the points where the input force (effort) and output force (load) are applied.
The effort arm, also known as the effort moment arm or input arm, is the distance between the fulcrum and the point where the force is exerted to overcome resistance. It determines the amount of effort needed to move the load and influences the mechanical advantage of the lever. If the effort arm is longer compared to the load arm, it requires less effort to lift the load, resulting in a mechanical advantage.
The load arm, also called the resistance arm or output arm, represents the distance between the fulcrum and the point where the load is placed or the force is delivered. It determines the distance over which the output force moves the load.
Understanding and calculating the relationship between the arms of lever is crucial to leverage mechanical advantage effectively. By adjusting the lengths of the effort and load arms, one can alter the force multiplication capabilities of the lever system. The arms of lever play a significant role in the analysis and functioning of various mechanical systems, such as seesaws, crowbars, and even human limbs.
