Question

Calculate the force required to lift a load of $60N$, placed at a distance of $3m$, from the fulcrum if the effort force is applied at a distance of $6cm$ from the fulcrum.

• A. $300N$
• B. $3000N$
• C. $1500N$
• D. $30N$

Answer 1

The correct option is B $3000N$

In order to lift the load we have to apply force such that it can balance the torque by load.

Or, Total torque shold be zero.

We know $\tau =r\times F$

$\Rightarrow {\tau }_{total}=\left(3\right)60-\left(0.06\right)F$... where F is force required.

$\Rightarrow \left(3\right)60=\left(0.06\right)F$

$\Rightarrow F=3000N$

Therefore, B is correct option.