Question

lf the distance between fulcrum and effort is more in a first order type lever, then :

• A. Load can be lifted with less effort
• B. Load has to be lifted with greater effort
• C. Load should be equal to effort
• D. Load should alwaYs bc less than effort

Answer 1

The correct option is A Load can be lifted with less effort

If the distance between fulcrum and effort is more than the load, load can be lifted with less effort.

let, distance of effort $=r_1$

distance of load $=r_2$

$r_1>r_2$

let effort $=F_1,Load=F_2$

now, equalizing torque about pivot,

$\begin{array}{cc}{F}_1{r}_1& =F_2{r}_2\\ \text{or}\frac{F_2}{F_1}& =\frac{r_1}{r_2}\end{array}$

$\begin{array}{cc}& \\ \text{or}\frac{F_2}{F_1}& >1\therefore \frac{r_2}{r_1}>1\end{array}$

or $F_2⟩F_1$

Ans, Option - A