lever action

The function of lever is to save labor or distance. The characteristic is that the product of force and resistance on the lever is equal to the product of its arm, so it saves time, effort and distance.

The fulcrum of the lever does not have to be in the middle. A system that satisfies the following three points is basically a lever: fulcrum, force point and force point.

Distance (torque) * stress = distance (arm) * force from fulcrum to stress point, so it is a lever. Levers also have labor-saving levers and labor-saving levers, which have different functions.

Extended data:

The essence of lever

1, the fixed point around which the lever rotates is called the fulcrum.

2. The force that makes the lever rotate is called force (the point of force is called the point of force).

3. The force that hinders the rotation of the lever is called resistance (the point of application is called the point of application of resistance).

3. When the rotating effects of force and resistance cancel each other out, the lever will be in a state of balance, which is called lever balance, but lever balance is not the balance of force.

Baidu encyclopedia-leverage