Why is a long screwdriver more labor-saving than a short screwdriver?
Technical principle:The screwdriver uses the work of the lever when it is used to pry the cover. The power point to the fulcrum distance bigger effort, so more effort than the short long screwdriver screwdriver.The screw driver uses the working principle of the wheel when it screws the screws. When the wheel is greater the more labor-saving, so use the coarse screwdriver than using a screwdriver to tighten the screws to the fine is more labor-saving.
If you do not consider the length of the screwdriver, just consider the torque of the moment, the two sides of the same.
In fact, the shorter ones are more labor-saving.Not to say that the rotation force, and that does not matter with length, with the thickness of the link.The length of the screwdriver to tighten the screws of the force is the same, but a long screwdriver stable force is greater than the short screwdriver, unless different materials, or a long screwdriver must in short screwdriver, the heavier the object control force will be more big.
A long screwdriver is no less labor-saving than a short screwdriver. It should be said that a crude screwdriver saves more effort than a thin screwdriver. The principle is the relationship between the arm and the moment. One of the lever principles is learned in junior high school physics
