1, labor-saving levers: bottles, juicers, nutcrackers, crowbars, wrenches, pliers, nail pullers, corkscrews, tin scissors, wire cutters, nail clippers, car steering wheels and so on.

2, equal arm levers: balance, fixed pulley, see-saw, clothes hanging, wall clock, and so on.

3, save the lever by the line of force to the pivot point of the distance is called the force arm. According to the formula F1L1 = F2L2 can be obtained, the longer the force arm the smaller the force. Save the lever, as the name suggests, its power arm is longer, the power is smaller, so save the force. But usually the force-saving lever saves the force will be corresponding to the cost of distance. An equal arm lever is a type of lever where the power arm and resistance arm are the same length, saving neither force nor distance.

Extended information:

p>1, labor-saving lever

Labor-saving lever power arm is larger than the resistance arm, the balance of power is less than resistance. Although the labor-saving, but cost the distance. < That is to say, when the length of the force arm (with the pivot point O as the dividing line) is greater than the length of the resistance arm, this is a force-saving lever.

2, equal arm leverage

In our history, there are also early records of leverage. The warring states era of the mojia had summarized the laws in this regard, in the "mojing" there are two special records of the principle of leverage. These two articles speak very comprehensively about the balance of the lever. In it, there are equal arms and unequal arms; there is changing the weight of the two ends to make it deflected, and there is changing the length of the two arms to make it deflected.

Baidu Encyclopedia - Labor-Saving Lever

Baidu Encyclopedia - Equal-Arm Lever