What is the correct name for the earth, sand, cart in the construction site?
WheelbarrowThe physics principle of trolley:Balance condition of lever:Power * power arm = resistance * resistance arm.That isIn the lever balance, the power arm is several times the resistance arm, the power is a few parts of the resistance.
The following steps are usually followed by the use of leverage equilibrium to analyze and calculate related problems:(1) determine the position of the lever pivot.(2) distinguish the power and resistance of the lever, make clear its size and direction, and give the schematic diagram of the output as much as possible.(3) determine the force arm of each force.(4) according to the lever balance condition, the relation formula is listed and solved.
Before the experiment, the balance nut of the lever should be adjusted so that it can balance on the horizontal position. The purpose is to make the center of gravity of the lever fall on the fulcrum so as to eliminate the influence of the gravity of the lever on the balance. When the lever balance, the distance between the O suspension hook yards distance is the arm, and can leverage on the lattice number instead of the size of the arm.
