Fishing rod, as shown in the figure, A is the fulcrum, L 1 is the power arm, and L2 is the resistance arm. According to the lever balance condition, F 1L 1=F2L2, as can be seen from the figure, l1; F2, laborious.
Shovel, as shown in the figure, O is the fulcrum, L 1 is the power arm, and L2 is the resistance arm. According to the lever balance condition, F 1L 1=F2L2, as can be seen from the figure, l1; F2, laborious.