Ask the physics master to answer! ! Math problem in the second day of junior high school! How to judge whether the resistance arm of an object is greater than the power arm or less than the power arm? Like scissors Step 1: Find the fulcrum.

Step 2: Look at the distance from the line of action of the force to the fulcrum, and then make a judgment.

Take scissors as an example: its arm of force is equivalent to the contact point between fingers and scissors, and the arm of force is equivalent to the distance between the contact point between the object to be cut and the scissors mouth and the fulcrum. Obviously, the power arm is larger than the resistance arm.