Question

A man wishes to lift a stone weighing 1440 N, using a first-class lever that measures 5 meters. What force should it perform if the fulcrum is 150 cm from the stone. *

Answer 1

Answer:

3360 N

Explanation:

In a first-class lever, the effort force and load force are on opposite sides of the fulcrum.

The lever is 5 m long.  The load force is 1.50 m from the fulcrum, so the effort force must be 3.50 m from the fulcrum.

The torques are equal:

Fr = Fr

(1440 N) (3.5 m) = F (1.5 m)

F = 3360 N