Today I'd like to introduce the power arm and drag arm. For example: seesaw.
On the left is the power arm, on the right is the resistance arm, and in the middle is the fulcrum. Here is a detailed introduction: if the object is placed on the resistance arm, the resistance arm of the warping plate will fall rapidly, and the power arm will rise rapidly, and it will be very difficult to press up the power arm. However, the longer the power arm, the less force is used; the shorter the power arm, the more force is used.
For example, this is the principle of smashing nails in life. The hammer head is the resistance arm, and the rod is the power arm. The more backward the hand is, the less force it will use. Let's think about what else we can do in our life: power arm and resistance arm