1. Physics A First Course
Forces and Motion
Chapter 3

2. Forces and Motion Conservation Laws
3.1 Newton's Third Law and Momentum
3.2 Energy and the Conservation of Energy
3.3 Collisions

3. 3A Investigation: Momentum and the Third Law
Key Question:
What makes moving objects keep going at the same speed in the same direction?
*Students read text section 3.1
AFTER Investigation 3A

4. 3A Investigation Topics
Perform collision experiments.
Measure time intervals.
Calculate speed using measured time intervals.
Calculate momentum.
Describe activity using the law of conservation of momentum.

5. Chapter 3.1 Objectives and Vocabulary
Use Newton's third law to explain various situations.
Explain the relationship between Newton's third law and momentum conservation.
Solve recoil problems.
Newton's third law
momentum
impulse
law of conservation of momentum

8. 3B Investigation: Conservation of Energy
Key Question:
What limits how much a system may change?
*Students read text section 3.2
AFTER Investigation 3B

9. 3B Investigation Topics
Measure time intervals.
Calculate speed using measured time intervals.
Measure height.
Graph speed vs. height of the car.
Calculate potential energy.
Use energy conservation to derive a formula for the speed of the car in terms of energy.

10. Chapter 3.2 Objectives and Vocabulary
Describe work and energy.
Calculate potential energy.
Calculate kinetic energy.
Apply the law of conservation of energy to explain the motion of an object acted on by gravity.
energy
joule
work
potential energy
kinetic energy
law of conservation of energy

13. Chapter 3.3 Objectives and Vocabulary
Distinguish between elastic and inelastic collisions.
Use momentum conservation to solve collision problems.
Explain how momentum, impulse, force and time are related.
collision
elastic collision
inelastic collision