(1) Figure 1 is a schematic diagram of the use of spike prizing, please draw the diagram in the figure of the labor force, and make the corresponding arm.(2) as shown in Figure 2, the A objects placed in the B object, A objects with B objects in F uniform external force under the action of linear motion. Please draw a sketch map of A objects by support force and ground stress.(3) a car accidentally drove into the mire, and the driver got a pulley to pull the car out of the mire. As shown, please figure out the most labor-saving rope winding method in Figure 3
(1) connecting the OA is the longest power arm. According to the balance of the lever, the lever should balance the power direction downwards, so that the smallest power can be drawn. As shown in the following figure:
(3) on the left side is the fixed pulley and the movable pulley, the fixed pulley rope from the start, then go back to the movable pulley, finally by four (up) the rope pull cars bear force, this is the most labor-saving winding rope. As shown in the figure:
(2) focus objects A along the vertical direction to draw a line with an arrow, and is represented by F B; key objects in contact with the ground along the downward direction perpendicular to the ground to draw a line with an arrow, with F said. As shown below:
