Question

1. A first class lever in statistics equilibrium has a 75 Ib resistance force and a 20 Ib effort force. The lever's effort force is located 5.2 ft from the fulcrum. What's the actual mechanical advantage of the system?

2. Using static equilibrium calculations, calculate the length from the fulcrum to the resistance force.

Answer 1

1. 3.75

2. 1.39 ft

Step-by-step explanation:

The mechanical advantage is the ratio of the resistance force to the effort force.

MA = 75 lb / 20 lb

MA = 3.75

The sum of the torques about the fulcrum equals zero.

∑τ = Iα

(20 lb) (5.2 ft) − (75 lb) x = 0

x = 1.39 ft

Round as needed.