Impulse and Momentum

Momentum and Impulse

Quarter 4 Module 4

What is momentum?

• This is also known as inertia in motion

• It is operationally defined as the product of the mass and the velocity of the object

• It is measured using the unit kg.m/s or Ns (Newton second)

Factors Affecting Momentum

Momentum is affected by mass and velocity.

For two objects having the same velocity, the bigger object has greater inertia and therefor has greater momentum

Multiple Choice

What could be the momentum of an object that is not moving?

• It is the same as its mass

• It is twice the value of its mass

• It is half of its mass

• It is zero

Formula for Computing for Momentum

Momentum (p) is equal to the mass of the object (kg) multiplied to its velocity (m/s)

Let us try to solve this problem on momentum

In this problem we can see that the mass of the bird is 0.018kg and its velocity is 15m/s.

Using the formula p = mv, we can see that the bird's momentum is 0.27kg.m/s or 0.27Ns

Let us try to solve this problem

So tell me, what was your answer?

If you have answered baseball then you are correct!

The baseball has a momentum of 0.98Ns whereas the golf ball has a momentum of 0.72Ns

What is impulse?

• It is the external force that acts on an object over a period of time that changes its momentum

• It is measured in Ns or Newton second

• Formula: Impulse (I) is equals to force (N) multiplied with time (s)

Try to solve this problem

In this problem, the object was pushed using a force of 120N. The time that the force was exerted was 35s. Therefore, the impulse is 4,200Ns.

Solve for the impulse

What is your answer?

If you got 50Ns then you got the right answer!