Momentum

Posted by Sek | 12:32 AM | | 3 comments »

Momentum

Momentum is defined as the product of mass and velocity.
Momentum is a vector quantity. It has both magnitude and direction.
The SI unit of momentum is kgms-1

Formula:
Example 1
A student releases a ball with mass of 2 kg from a height of 5 m from the ground. What would be the momentum of the ball just before it hits the ground?

Answer:

In order to find the momentum, we need to know the mass and the velocity of the ball right before it hits the ground.

It's given that the mass, m = 2kg.

The velocity is not given directly. However, we can determine the velocity, v, by using the linear equation of uniform acceleration.

This is a free falling motion,
The initial velocity, u = 0
The acceleration, a = gravirational acceleration, g = 10ms-2
The dispacement, s = high = 50m.
The final velocity = ?

From the equation
v2 = u2 + 2as
v2 = (0)2 + 2(10)(5)
v = 10ms-1
The momentum,
p = mv =(2)(10) = 20 kgms-1

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3 comments

  1. shafique // March 12, 2009 at 9:04 AM  

    very informative :) thanks !

  2. albus lee // October 23, 2009 at 3:11 AM  

    Good... a very informative, effective and best note i ever saw before

  3. eka // February 7, 2011 at 1:11 AM  

    TAHNKSSSSS A LOTTT XD .