#### Chapter 3: Conservation Laws

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Transcript Chapter 3: Conservation Laws

Physics A First Course
Forces and Motion
Chapter 3
Forces and Motion
Conservation Laws
3.1
Newton's Third Law and Momentum
3.2
Energy and the Conservation of Energy
3.3
Collisions
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
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.
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
3B Investigation: Conservation of Energy
Key Question:
What limits how much a
system may change?
*Students read text section 3.2
AFTER Investigation 3B
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.
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
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