Question

A lever of length 120cm has its fulcrum at a distance of 20cm from the load. Calculate the mechanical advantage of the lever​

Answer 1

Answer:

The mechanical advantage of the crowbar is 5.

Given data states that there is a crowbar with 120 cm length and fulcrum of the crowbar is at 20 cm distance from the load. The crowbar is an example of lever belonging to the class I.

Thereby the fulcrum needs to be situated somewhere in between the two, from the load and the effort. The load arm is given as 20 cm and total length as 120 cm so the effort arm will be \Rightarrow \text { effort } a r m=120-20=100 \mathrm{cm}⇒ effort arm=120−20=100cm

Thereby Mechanical advantage =\frac{\text { effort arm }}{\text { load arm }}=

load arm

effort arm

\Rightarrow \text { Mechanical advantage }=\frac{100}{20}=\bold5⇒ Mechanical advantage =

20

100

=5