1. Physical Science: Chapter 12, Section 3 Newton’s Third Law of Motion
For every __________________force,
there is an
__________and
______________
force.

2. Physical Science: Chapter 12 Newton’s Third Law of Motion
Newton’s Third Law of Motion This means that when one object exerts a force on a second object, the second object ______ ______________________ ______________________.

3. Physical Science: Chapter 12 Newton’s Third Law of Motion
The “_____________” part means that the “reaction force”will be the ___________ ___________________as the “action force.”
The “_____________” part means that the direction of the “reaction force” will be in the _________________________as the “action force.”

4. Physical Science: Chapter 12 Newton’s Third Law of Motion
Forces always occur in ____________, 1. __________forces and 2.______________forces. Forces in pairs do _________act on the same object. Each force acts on a __________________object.

5. Momentum
______________is the “___________” of ____________of a ____________object.
Momentum (____) of an object moving in a _______________line is calculated by multiplying the object’s ______times its __________.
______ = __________

6. Physical Science: Chapter 12 Newton’s Third Law of Motion
Momentum
Momentum is determined by the _____________of an object.
Momentum is also determined
by the ____________of an object.

7. Physical Science: Chapter 12 Newton’s Third Law of Motion
Momentum
Which one would have MORE
momentum?

8. Physical Science: Chapter 12 Newton’s Third Law of Motion
Momentum
Momentum (p) can also be
calculated by dividing the
____________needed to “stop” an
object, divided by ________it took.
___ = __________

9. Momentum
A catcher will pull their glove backwards as they catch a ball to increase the __________ it takes to stop the ball’s ____________________.
Because it takes ________ for the ball to stop (lose its ____________) there is less ______________on the catcher’s hand.

10. Physical Science: Chapter 12 Newton’s Third Law of Motion
Conservation of Momentum
The Law of __________________________
_______________states that the _________
amount of
momentum within
an ____________system
is “_________________.”

11. Physical Science: Chapter 12 Newton’s Third Law of Motion
Conservation of Momentum
Momentum can be _____________to
a different object, but then the
momentum of
the first
object is
_______________.

12. If momentum is conserved, why don’t pool balls keep moving forever?
The Law of Conservation of momentum applies to “_______ systems” that can’t lose __________to their _______________.
A pool ball “system” (like most _______systems) is ____ isolated and can lose ______ to ___________.

13. Physical Science: Chapter 12 Newton’s Third Law of Motion
Mini-Quiz #6
1). What is the common formula for
momentum?
2). What does the Law of Conservation of
Momentum state?
3). How much momentum in a bowling ball
(mass 5.5kg) moving at 2.5m/s?

14. Physical Science: Chapter 12 Newton’s Third Law of Motion
Mini-Quiz #6
4). Why is it better to take longer to change
the momentum of an object?
5). When ISN’T momentum conserved?
6). In determining momentum, which is
more important, mass or speed?

15. Physical Science: Chapter 12 Newton’s Third Law of Motion
Mini-Quiz #6
7). Which one would have MORE momentum?

16. Physical Science: Chapter 12 Newton’s Third Law of Motion
Things to Know
1). What does Newton’s Third Law of
Motion state?
2). In Newton’s Third Law of Motion, what
does equal and opposite mean?
3). Why don’t the two forces just “cancel
out?”

17. Physical Science: Chapter 12 Newton’s Third Law of Motion
Things to Know
4). What is the common formula for
momentum?
5). What does the Law of Conservation of
Momentum state?
6). How to calculate momentum, mass or
velocity from the momentum formula.

18. Physical Science: Chapter 12 Newton’s Third Law of Motion
Things to Know
7). Why is better to take longer to change
the momentum of an object?
8). Why ISN”T momentum always
conserved?
9). Know how to determine or calculate
which object has more momentum.

19. Physical Science: Chapter 12 Newton’s Third Law of Motion
Chapter 12 Section 3 Quiz
1). What is the common formula for
momentum?
2). What does Newton’s Third Law of
Motion state?
3). What does the Law of Conservation of
Momentum state?

20. Physical Science: Chapter 12 Newton’s Third Law of Motion
Chapter 12 Section 3 Quiz
4). If the action force is 20N to the South,
what is the reaction force?
5). What is the momentum of a 4000kg
elephant running at 2.0m/s?
6). When does the Law of Conservation of
Momentum NOT work?

21. Physical Science: Chapter 12 Newton’s Third Law of Motion
Chapter 12, Section 3 Quiz
7). Which one would have MORE momentum? Why?

22. Physical Science: Chapter 12 Newton’s Third Law of Motion
Chapter 12, Section 3 Quiz
8). Which one would have
MORE
momentum?
Why?