1. Momentum and Impulse
Lesson 1

2. Objectives
Be able to define momentum and impulse, both qualitatively and quantitatively.

3. Momentum
The only quantity of motion conserved in all collisions is mv. This makes it a very special quantity and is therefore afforded a special name … MOMENTUM. Direction is important for momentum and it is therefore a vector.
Momentum is defined as the product of mass and velocity.

4. Scalar: Quantities with magnitude but no direction.
Definition:
Scalar: Quantities with magnitude but no direction.
( e.g. distance, speed, time and energy )
Vector: Quantities with magnitude and direction ( e.g. displacement, velocity, acceleration, force, momentum )
Computing With Momentum
The quantity for an object is its momentum,
given the symbol .
Where p = momentum in kgm/s
m = mass in kg
v = velocity in m/s *

5. Example 1: What is the momentum of a 680 g toy train moving at 28
Example 1: What is the momentum of a 680 g toy train moving at 28.9 cm/s east?
Example 2: If the momentum of a kg softball is 5.89 kg·m/s W, what is its velocity? *

6. Example 3: If Glen’s momentum is 146 kg·m/s R at a speed of 3
Example 3: If Glen’s momentum is 146 kg·m/s R at a speed of 3.74 m/s, what is Glen’s mass?
Example 4: If Tom’s mass with his bike is 61.4 kg and he speeds up from 4.17 m/s N to 9.49 m/s N, what is Tom’s change of momentum? *

7. Proportionalities and Momentum
Example 1: If the mass of a moving object is doubled, what is its new momentum?

8. Example 2: If the speed of an obejct is reduced by a factor of 4, how has its momentum changed?

9. Newton’s 2nd Law and Momentum