Quarter 4 Module 4

3. SHORT
RECAP

4. MOMENTUM
The measure of an object’s resistance to changes in its
state of motion due to the application of a force.
Momentum = mass • velocity
Momentum = mass in motion
p = m • v

5. IMPULSE
When a force is applied to an object, it will result in a
change of momentum. This change may involve a shift
in velocity, such as an increase or decrease in speed, or
a change in direction.
Impulse = Momentum Change
An impulse causes a momentum change

6. SAMPLE PROBLEM:
1) What is the momentum of a child and wagon if the
total mass of the child and a wagon is 22 kg and the
velocity is 1.5 m/s?

7. SAMPLE PROBLEM:
1) What is the momentum of a child and wagon if the
total mass of the child and a wagon is 22 kg and the
velocity is 1.5 m/s?

8. CONSERVATION
OF MOMENTUM

9. Learning objectives:
At the end of the lesson, students should be able to:
compare the total momentum before and
after collision in an isolated system
discuss the Law of Conservation of
Momentum
solve problems involving conservation of
momentum

10. ACTIVITY 1:
WHAT’S THE
WORD?

11. an instance of one moving
object or person striking
violently against another
[ Arrange the letters here. ]

12. an instance of one moving
object or person striking
violently against another

13. refers to something
which doesn’t
change
[ Arrange the letters here. ]

14. refers to something
which doesn’t
change

15. product of the mass
of a particle and its
velocity
[ Arrange the letters here. ]

16. product of the mass
of a particle and its
velocity

17. an organized collection of
parts that are highly
integrated to accomplish
an overall goal
[ Arrange the letters here. ]

18. an organized collection of
parts that are highly
integrated to accomplish
an overall goal

19. MOMENTUM
BEFORE AND
AFTER
COLLISION

20. ELASTIC COLLISION
INELASTIC COLLISION
Before Collision Collision After Collision
A.
B.
C.

21. CONSERVATION OF MOMENTUM
Note:
• in studying the momentum of two or
more colliding objects, we need to
consider a closed system or isolated
system.
• in all collisions, momentum is
conserved, because of the law of
conservation of momentum

22. THIRD LAW OF MOTION
NEWTON'S
States for every action, there is an
equal but opposite reaction.

23. LAW OF CONSERVATION OF MOMENTUM
States that:
• when two objects in an isolated
system collide, the total momentum
of the objects before the collision is
equal to the total momentum of the
objects after the collision.

24. CONSERVATION OF
MOMENTUM
where:
•
•
•
•
•

25. SAMPLE PROBLEM:
A 12,600-kg railroad car travels alone on a level frictionless
track with a constant speed of 18.0m/s. A 5350-kg load,
initially at rest, is dropped onto the car. What will be the
car’s new speed?

26. SOLUTION

27. SAMPLE PROBLEM:
A 2 kg blob of putty moving at 4 m/s slams into a 6 kg blob
of putty at rest. What is the speed of the two stuck-
together blobs immediately after colliding?

28. SOLUTION

29. SOLVE IT!
• A 100 kg football player runs at 8 m/s and
plows into an 80 kg referee standing on the
field causing the referee and the player stick
together and fly forward. What would the
new velocity be?

30. SOLVE IT!
• A 2.0 kg mass is moving on a frictionless
airtrack. It collides into a motionless 1.5 kg
mass. What is the the combined speed of the
two masses if they stick together on impact?

31. SOLVE IT!
• A railroad car slams
into another railroad
car and couples
together. What is the
combined speed of
the railroad cars
after the collision?

32. QUESTIONS &
CLARIFICATIONS?

33. THANK YOU FOR
LISTENING!