Question

1. A worker uses a board that is 4 m long to pry up a boulder. A small rock is used for a

fulcrum and is placed 0.5 m from the resistance end of the lever. Calculate the MA of the
I
board.

Answer 1

7

Step-by-step explanation:

Mechanical advantage is given by the ratio of the distance of the fulcrum from the two objects of the system.

Here the boulder is
`0.5\ \text{m}` from the fulcrum and the mass at the other end of the lever is
`4-0.5=3.5\ \text{m}` from the fulcrum.

So, mechanical advantage is given by

`MA=(3.5)/(0.5)\\\Rightarrow MA=7`

So, mechanical advantage of the board is 7.