Question

A crowbar of length 1.5 m is used to lift a rock of weight 1500 N. If the
rock is at a distance of 0.5 m from the fulcrum and effort is applied at a
distance of 1 m from the fulcrum, calculate the effort needed to lift the
load.​

Answer 1

Explanation:

Load =75kgf

Length of crowbar =1.5m

Effort arm =1m

So, Load Arm =Length of crowbar - Effort arm

⇒1.5−1=0.5m

Mechanical Advantage =

Load Arm

Effort Arm

=

0.5

1

=2

Effort needed =

Mechanical Advantage

Load

=

2

75

=37.5kgf