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Momentum

- Measure of Mass in Motion
- All Objects Have Mass
- If an Object is Moving, then it is a Mass in Motion
- 2 Variables
- How Much Stuff (Mass) is Moving
- How Fast (Velocity) the Stuff is Moving

Think of a ball bouncing off a wall. It leaves the wall at the same speed as before. Let’s call going from right to left negative, and going from left to rightpositive.

The diagram shows two cars at a fairground, before and after bumping into each other. One car and driver has a total mass of 500 kg, while the other car and driver has a total mass of 400 kg.

Momentum, Continued

- P=MV
- Mass: kg
- Velocity: m/s
- Units: kg∙m/s
- Determine the momentum of a ...
- a. 60-kg halfback moving eastward at 9 m/s.
- b. 1000-kg car moving northward at 20 m/s.
- c. 40-kg freshman moving southward at 2 m/s.
- A car possesses 20,000 units of momentum (kg∙m/s) What would be the car\'s new momentum if ...
- a. its velocity were doubled.
- b. its velocity were tripled.
- c. its mass were doubled (by adding more passengers and a greater load)
- d. both its velocity were doubled and its mass were doubled.

Law of Conservation of Momentum

- When two particles (or other things) collide, both of them have a momentum. What happens to their momenta when they collide?

Newton’s Cradle

- When an end ball is pulled up and let go, it swings down as a pendulum and hits the next ball. The energy and momentum from that ball is transmitted through the three balls at rest to the ball on the other end. That ball is propelled forward at the same speed as the first ball had due to the force of the first collision.
- Why Does it Slow Down and Eventually Stop?
- Since it is a form of pendulum, the action will go back and forth until it slowly slows down due to losses from friction and the elasticity of the steel spheres.

Law of Conservation of Momentum

- The Momentum of a SYSTEM remains constant

Videos!

- Momentum 1 (2 min)
- Momentum 2 (2 min)
- Momentum 3 (5 min)

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