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1在杠杆上求作最小的力1.1已知支点和动力的作用点,在杠杆上求作最小的力例1如图1所示的利用羊角锤拔钉子的过程中,在A点用最小的力将钉子拔出来,作出该力的示意图.解析拔钉子所需的力是一定的,所以羊角锤所受的阻力F2(如图2所示)也是一定的,而F2所对应的力臂也固定,因此F2l2固定.根据数学知识,只要连接OA,作为动力臂,即为最长动力臂.根据
1 in the lever for the smallest force 1.1 known points and the role of the power point in the lever to make the smallest force Example 1 as shown in Figure 1 using claw hammer nails in the process, at point A with the smallest Force to pull out the nail, to make a sketch map of the force.It is necessary to analyze the force required to pull the nail, so the resistance of the claw hammer F2 (as shown in Figure 2) is also certain, and F2 corresponds to the force arm Fixed, so F2l2 fixed. According to mathematical knowledge, as long as the connection OA, as the power arm, the longest power arm. According to