China Naming Network - Eight-character query< - Why are shovels and fishing rods laborious levers?

Why are shovels and fishing rods laborious levers?

Look at the picture. If you don't understand, you can ask.

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.