Question

In a machine, a load of 490 N is supported by an effort of 7N. If the distance of fulcrum from the point where the load acts is 10m, find the mechanical Advantage and length of the effort arm.

• A. Effort arm = 70m, Mechanical advantage = 6
• B. Effort arm = 40m, Mechanical Advantage = 6
• C. Effort arm = 70m, Mechanical Advantage = 7
• D. Effort arm = 70m, Mechanical Advantage = 10

Answer 1

The correct option is C

Effort arm = 70m, Mechanical Advantage = 7

Load = 490 N

Effort = 70 N

Load arm = 10m

Effort arm = ?

$load\times loadarm=effort\times effortarm$

$490N\times 10=70N\times x$

$x=\frac{4900}{70}$

x = 70m

Effort arm = 70m

Mechanical Advantage = $\frac{load}{effort}$

= $\frac{490}{70}$ = 7