What lever is human forearm?

The human forearm is a laborious lever.

The lever balance condition is that the power times the power arm equals the resistance times the resistance arm, so under the lever balance condition, when the power (F 1) is greater than the resistance (F2) and the power arm (L 1) is less than the resistance arm (L2), the lever is a laborious lever.

Features: laborious and distance-saving power arm is shorter than resistance arm, and the power is greater than resistance, so it can be called laborious lever. Formula: when L 1×F 1=L2×F2, l1; Second generation

Benefits: The laborious lever is not really "laborious", but saves the distance of power movement. In this way, in the case of a small amount of movement, the distance of the other section can be moved a lot, thus achieving the expected purpose. That is to say, although it is laborious, the power moving distance is less than the resistance moving distance, which saves the distance.

Extended data:

Five elements of leverage:

Fulcrum: the point around which the lever rotates, usually represented by the letter O.

Force: the force that makes the lever rotate, usually expressed as F 1

Resistance: the force that prevents the lever from rotating, usually expressed as F2.

Arm of force: the distance from the fulcrum to the action line, usually expressed by L 1

Resistance arm: the distance from the fulcrum to the line of resistance action, usually denoted by L2.

(Note: Power action line, resistance action line, power arm and resistance arm are all indicated by dotted lines. The lower angle of the force arm changes with the lower angle of the force. For example: if the power is F3, the power arm is L3; The resistance is F5 and the resistance arm is L5. )

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