1. Ch8 Impulse-Momentum What is momentum? Equation Newton’s Laws
Sports
Politics
Physics
Equation
Newton’s Laws
Newton’s 2nd Law – a different story
System
Center of mass

2. What is the secret to the egg toss?
Ch8
Impulse
What is the secret to the egg toss?

3. Ch8 Impulse What is the secret to the egg toss? Impulse J Collisions
Complex
Average vs. instantaneous
forces
Time
Graphs
Momentum

4. Conservation of Momentum
Ch8
Conservation of Momentum
Newton’s Laws – Momentum
1st – merry-go-round
2nd – block down a ramp
3rd – rock falling to earth
When is momentum conserved?
How is it conserved?
Falling rock
Sand dropped in box car
In terms of forces
In terms of momentum, different systems

5. Lab 5 Always record uncertainty and units Never say “human error”
Write clearly
Be quantitative: avoid “not very accurate,” “really close”
Show/explain work/calculations
Use full sentences
Attach separate pages to ensure you have a full report, i.e. discussion of error, diagram, further questions, difficult procedures, etc.
In other classes lab write-ups are more precise

6. Ch8 Collisions Newton’s Cradle Collisions Perspective of Forces
1 stationary, 1 moving
Both moving
Bounce – Elastic
Stick – Inelastic
Multiple dimensions
Many-bodies
Opposite of a collision?
Center of Mass
KE lost
Perspective of Forces

7. Ch8 Problems Examples – Collisions Physical situation Representation
Conceptual – System, Before/After, Conservative?
Visual – Drawing, Coordinate System
Mathematical – Set up equations, vectors require components in independent directions
Solution
Interpretation
Units
Limiting cases
Reasonableness