Question

Find the effort required to lift a stone of mass 120 kg with the help of a lever 1.5 m long, if the load arm is 0.3 m (Take g = 10 ms-2)

Answer 1

Given:

Mass of the stone = 120 kg

Length of the lever = 1.5 m

Length of the load arm = 0.3 m

To find:

The effort required to lift the stone

Calculation:

Weight of the stone = m×g

                                 = 120×10 = 1200 N

We know the relation

      $\frac{Effort\ arm}{Load\ arm} =\frac{Load}{Effort}$

By substituting the values in the above relation

      $\frac{1.5}{0.3} =\frac{1200}{Effort}$

      $Effort=\frac{1200\times0.3}{1.5}$

      $Effort=240\ N$

Final Answer:

The effort required to lift the stone is 240 N