Question

4. A crowbar of length 1.5 m is used to lift a heavy load of
90 kgf. It has its fulcrum at a distance of 12.5 cm from
the load. Calculate the minimum value of effort to be
applied by a person so as to lift the load successfully.
What is the mechanical advantage of crowbar?
of 140 Nic haine auorcomo​

Answer 1

Answer:

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