Traditional Culture Encyclopedia - Traditional culture - Lever principle of bicycle pedal
Lever principle of bicycle pedal
Because you apply force downward, because it is vertical downward, and because the vertical distance from the fulcrum (that is, the shaft of the gear next to the pedal) to the force is the force arm, when the pedal is turned to the middle position, the distance from one foot to the pedal shaft is the force arm, which is also the longest force arm, and the other is the resistance arm. Because the power arm * power = resistance arm * resistance, therefore, in order to minimize the power, it is necessary to maximize the power arm.
F 1 is the power arm and L 1 is the resistance arm.
After reading the picture, compare L 1 which is bigger (that is, the power arm is bigger).
You will know which F 1 is small, which is the least labor-saving and which is the best.
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