- Oct 10, 2017 -
Scissors use the principle of leverage.
The lever principle is also known as the "Lever balance condition". To balance the lever, the two torques (the product of force and arm) must be equal in size. namely: Power X-Power arm = resistance X-resistance arm, expressed as f1· in algebra L1=f2· L2. In the formula, the F1 expresses the power, the L1 means the power arm, the F2 represents the resistance, the L2 represents the resistance arm. From the top can be seen, to make the lever to achieve balance, the power arm is a few times the resistance arm, the resistance is the power of several times.
The fulcrum of the scissors in the middle, is the first type of lever, both labor and can be laborious. Cutting branches: The branch is hard, to use a larger force to trim, which shows that the resistance is greater, need to labor-saving lever, with a shorter blade scissors. Paper-cutting or cloth: with a small force can be cut open, which shows less resistance, at the same time in order to speed up the shear speed, it is necessary to use a long blade scissors. Similarly a pair of scissors, when using, hand operation of different parts, labor-saving situation is not the same, the hand closer to fulcrum more effort, and vice versa, more laborious. Trim the object in the edge closer to the fulcrum more labor-saving, scissors mouth thin and sharp, is the use of the principle of the slant, cant also save effort.
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