What are the principles of a screwdriver with a simple machine?
The distance from the line of action of You Li to the fulcrum is called the arm of an arm. According to the formula F1L1=F2L2, the more the smaller arm of changli. The utility model relates to a labor-saving lever, as the name suggests, the power arm is longer, and the power is small, so the utility model saves labor. But usually the effort saves the lever and saves the effort.
A rod (not necessarily straight, can be bent, but must be hard, not easy to deformation. Such as the curved bar), under the action of force, can rotate around the fixed point, the root is the lever rod.
A screwdriver is a simple, mechanical, labor-saving lever.
