1. Section 3 Newton’s Third Law p. 360
Chapter 11 Forces
Section 3
Newton’s Third Law
p. 360

2. Interact with 3rd law of motion
Objectives
Interact with 3rd law of motion

3. I. Action and Reaction
A. For every action [force], there is an
equal and opposite reaction [force]
B. Occurs in pairs – equal in size but
opposite in direction
C. The pairs do not act on the same
object so it does not cancel out
D. Equal force does not always have
equal effects

4. II. Momentum
A. Momentum (p=mv) mass x velocity
p= kg x m/s (+ direction)
B. Force is related to change in
momentum- Momentum over time is
Force (N)
C. Momentum is conserved in collisions
Law of conservation of momentum-
the total amount of p in an isolated
system is conserved
D. When momentum is not transferred
to another object it is conserved