Question

A man uses a crowbar of length 1.5m to raise a load of 5kgf by putting a sharp edge below the bar at a distance of 1m from his hand.calculate load arm and effort arm

Answer 1

its a first class lever in which the fulcrum is between load and efforts so the load arm is of 0.5 m and effort arm is of 1 m and the effort needed is of 2.5 kgf

Answer 2

b) It's a class 1 lever

c)

1)LA=1.5-1=0.5m

2)EA=1m( given)

3)MA=EA/LA

MA=1/0.5

MA=2

4)MA=L/E

E=L/MA

E=75÷2

E=37.5kgf