Momentum is calculated by multiplying an object's mass by its velocity. It is measured in kg*m/s. Slowing down decreases an object's momentum because its velocity decreases, even if its mass stays the same. Increasing force increases velocity and therefore momentum. The total momentum before a collision equals the total momentum after, according to the law of conservation of momentum.

1. Define & Give Examples!
• Motion – an object that is moving e.g. cars, trains, soccer ball etc.
• At Rest
• Reference Points
• Relative Motion
• S.I. Units
• Velocity
• Acceleration

2. MomentumWhat is Momentum?
The amount of motion a moving body has on another
object because of its mass & velocity.

5. Two Main Things For Momentum?
•Velocity (m/s).
•Mass (kg).

6. Mathematical!
Mass x Velocity = Momentum
Kilograms (kg)
x Meters per Second (m/s)
= Kilograms.Meters per Second (kg.m/s)

7. Example
• Mr. Holland’s mass is 70kg, he runs at a speed of 4m/s.
• What is Mr. Holland’s momentum?
70kg x 4m/s =
280
kg.m/s

8. Apply It!
•Page 283
•Questions 1 & 2
•Let’s make some MATH!

9. Key Concept Questions
• What do we use to calculate the momentum of a moving object?
• Multiplication. X.
• What quantities do we multiply?
• Mass of a moving object & its Velocity.
• How could an object with a large mass have the same momentum as an object with a small mass?
• If the small mass has a greater velocity than the large mass.

10. Key Concept Questions
• What unit is used to measure Momentum?
• Kg.m/s aka Kilograms times Meters per Second.
• When a car slows down, it’s velocity decreases but it’s mass stays the same. How does slowing
down affect the car’s momentum?
• The car’s momentum decreases.
• How does increasing force affect momentum?
• Increasing force increases velocity therefore increasing momentum.

12. Conservation of Momentum
Total Momentum Before Collision
Equals
Total Momentum After Collision
VelocityA x MassA = VelocityB x MassB

13. Recap

14. Do They Have The Same Momentum?
• How?

15. Test Your Understanding
• Page 284 & 285.
• Answer everything about the Yellow, Red, Blue & Green cars!

16. ATTENTION!!
•Homework
•Review and Exam next week!