First slide

Law of conservation of momentum and it's applications

Question

N bullets each of mass m kg are fired with a velocity v ms^-1 at the rate of n bullets per second upon a wall. The reaction offered by the wall to the bullets is given by

Moderate

A

$n m v$
B

$\frac{Nmv}{n}$
C

$n \frac{N m}{v}$
D

$n \frac{N v}{m}$

Solution

$Total mass of bullets = Nm, time t = \frac{N}{n}$
$Momentum of the bullets striking the wall = N m v$
$Rate of change of momentum (Force) = \frac{N m v}{t} = n m v$

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