# A balanced lever has two weights on it, the first with mass 5 kg  and the second with mass 8 kg. If the first weight is  4 m from the fulcrum, how far is the second weight from the fulcrum?

May 1, 2016

$x = 2.5 m$

#### Explanation:

First of all remember that the principle of moments must apply which is the anticlockwise moment=clockwise moment.
Now use the formula $F \cdot d = F \cdot d$
but before that convert the masses into weight by multiplying by 10
which is the gravitational force so
$5 \cdot 10 = 50 N$
$8 \cdot 10 = 80 N$
no using the formula
$50 \cdot 4 = 80 \cdot x$
$x = 2.5 m$