Lawton's law

1. RECALL!
•What did you learn on the
last topic discussed to
the class?

2. ENGAGE!
•Have you ever experience
difficulties in stopping a
moving object? If yes, why
do you think so?

3. ENGAGE!

4. ENGAGE!
• VIDEO

5. Newtons Laws of
Motion
I. Law of Inertia
II. F = ma
III. Action-Reaction

6. Learning Objectives
• Learners will be able to state the Newton’s Laws of
Motion.
• Learners can apply Newton’s Laws of Motion to
real life situations.
• Learners will be able to explain and demonstrate
the relationship between inertia and mass.

7. Newton’s Laws of Motion

8. Background
Sir Isaac Newton (1643-1727) an English scientist
and mathematician famous for his discovery of the
law of gravity also discovered the three laws of
motion. He published them in his book Philosophiae
Naturalis Principia Mathematica (mathematic
principles of natural philosophy) in 1687. Today
these laws are known as Newton’s Laws of Motion
and describe the motion of all objects on the scale
we experience in our everyday lives.

9. Newton’s 3 Laws of Motion
1. An object in motion tends to stay in motion
and an object at rest tends to stay at rest
unless acted upon by an unbalanced force.
2. Force equals mass times acceleration
(F = ma).
3. For every action there is an equal and
opposite reaction.

10. Newton’s First Law
(law of inertia)
An object at rest tends to stay at rest
and an object in motion tends to stay
in motion unless acted upon by an
unbalanced force.

11. Newton’s First Law
of Motion:
• Also know as: Law of Inertia!
– Inertia is an objects resistance to a change in its motion (even if it isn’t
moving at all!)
– Inertia is caused because objects have mass
– The more mass an object has, the more inertia!
– “An object at rest will stay at rest unless it is acted upon by an outside
force.” (and the opposite is also true! An object in motion will stay in…blah blah blah)

12. Newton’s First Law
of Motion:
• Basically, an object will “keep doing what it was
doing” in the same direction at the same speed
unless acted on by an unbalanced force.
• If the object was sitting still, it will remain
stationary. If it was moving at a constant velocity, it
will keep moving.
• It takes force to change the motion of an object.

13. Newton’s First Law
of Motion:
RECAP: What is meant by
unbalanced & balanced force?

14. Newton’s First Law
of Motion:
• If the forces on an object are
equal and opposite, they are
said to be balanced, and
the object experiences no
change in motion. If they
are not equal and opposite,
then the forces are
unbalanced and the motion
of the object changes.

15. Newton’s First Law
of Motion:
The Relationship between Mass & Inertia
The amount of inertia
that an object has is
dependent on the
object’s mass. The
more mass an object
has the more inertia it
has.

16. Newton’s First Law
of Motion:
The Relationship between Mass & Inertia

17. ELABORATE!
Analyze the
picture given and
answer the
questions
provided.

18. ELABORATE!
1. Who has more mass, the
sumo wrestler or the little
boy?
2. Who has more inertia, the
sumo wrestler or the little
boy?
3. Who is harder to move?
Why?
4. How is mass related to
inertia?

19. Newton’s First Law
of Motion:
If an object has a large amount of
inertia (due to a large mass)
1. It will be hard to slow it down
or speed it up of it is moving.
2. It will be hard to make it start
moving if it is at rest.
3. It will be hard to make it
change direction.
The
Relationship
between Mass
& Inertia

20. ELABORATE!
COMPLETE THE SENTENCE.
I have learned that:

21. EVALUATE!

22. EVALUATE!

23. RECALL!
•What did you learn on the
last topic discussed to
the class?

24. ENGAGE!
•Volunteer:
–3 chairs,

25. Newton’s Second Law
(law of acceleration)
The acceleration of an object is directly
proportional to the net force acting on it
and is inversely proportional to the
object’s mass. The direction of the
acceleration is in the direction of the net
force acting on the object

26. Newton’s Second Law
(law of acceleration)
• Force equals mass times
acceleration.
• F = ma
• Acceleration: a measurement of how
quickly an object is changing speed.

27. Newton’s Second Law
(law of acceleration)

28. Newton’s Second Law
(law of acceleration)
MORE MASS NEEDS
MORE FORCE FOR
GREATER
ACCELERATION

29. ► More Force = more Acceleration
► More Mass = more Force needed!
Newton’s Second Law of Motion
says:
“To move a mass, you need a force!”
Also known as F=ma
I am
so
smart
…
The greater the mass = greater inertia = more force needed!

30. What do you think happens to our acceleration
w/ different masses?
Distance
Time
Less Mass =
less force
needed
More Mass =
more force
needed
½ kg
1kg
2kg
With less mass, it doesn’t take as
much effort to get it moving;
therefore, I can move it farther in
less time (faster).
With more mass, it takes more
effort to get it moving; therefore, it
takes me more time to move it
farther (slower).

31. What do you think happens to our acceleration w/ different
masses if we pushed with the same amount of force?
Distance
Time
Which one of these lines do you
think would represent a sports
car? SUV, Diesel Truck?
Sports car would be the steepest line!
Steeper = more velocity!!!
The Diesel truck would be the least steep line!
Less steep = less velocity!!!
The SUV would be the middle line!
Steepness of line is in the
middle = middle velocity

32. Newton’s Second Law
(law of acceleration)
Study and understand the problems given:
1. A 1000.00 kg truck is
traveling at an acceleration of
4.5000 m/s2
, East. Find the net
force needed to accelerate the
truck.

33. Newton’s Second Law
(law of acceleration)
Study and understand the problems given:
2. A boy rolls a 200g baseball
horizontally on the floor with a
net force of 2N to the right.
What is the acceleration of the
baseball?

34. ELABORATE!
COMPLETE THE SENTENCE.
I have learned that:

35. QUIZ. 2 EVALUATE!
Mario and Alex are on
trip to Tinuy-an Falls
Bislig City, Surigao del
Sur. Suddenly the car runs
out of fuel then stops.
Alex volunteers to push
the car to the side of the
road. He pushes it hard,
but he cannot barely move
the car. A bystander helps
him then the car
accelerates.

36. QUIZ. 2 EVALUATE!
PART 1.

37. QUIZ. 2 EVALUATE!
PART 2. Read and solve the given problems carefully.
Write your answers at the back of your notebook.
1. An object accelerates 12.0
m/s2
when a force of 6.0 newton
is applied to it. What is the mass
of the object?

38. QUIZ. 2 EVALUATE!
Quiz. 2 Read and solve the given problems carefully.
Write your answers at the back of your notebook.
2. An object with a mass of 2.0 kg
has a force of 4.0 newtons
applied to it. What is the resulting
acceleration of the object?

39. QUIZ. 2 EVALUATE!
Quiz. 2 Read and solve the given problems carefully.
Write your answers at the back of your notebook.
3. An object with a mass of 5.0 kg
accelerates 8.0 m/s2
when an
unknown force is applied to it.
What is the amount of force

40. QUIZ. 2 EVALUATE!
Quiz. 2 Read and solve the given problems carefully.
Write your answers at the back of your notebook.
4. Anakin rolls a 400g tennis ball
horizontally on the floor with a net
force of 2N to the right. What is
the acceleration of the tennis ball?

41. RECALL!
•What did you learn on the
last topic discussed to
the class?

42. ENGAGE!
WHAT YOU NEED:
MARBLES and FLAT SURFACE
DIRECTION:
1. Pick 2 of your marbles
2. Place one of your marble at the end of your flat surface
3. Roll the other marble towards the stationary marble

43. SEATWORK 2. EVALUATE

44. SEATWORK 2. EVALUATE

45. SEATWORK 2. EVALUATE

46. SEATWORK 2. EVALUATE

47. ENGAGE. BALLON ROCKET

48. ENGAGE. BALLON ROCKET

49. ENGAGE. BALLON ROCKET
Analyze and Conclude:
1.Once you have the balloon set, what happens when
you let go of it? What causes this to happen?
2.What do you think will make the balloon move
faster?
3.What happens when you add cargo to the balloon
rocket?
4.What forces act on the balloon?
5.What is the reaction force acting on the balloon?
6.What are the action-reaction pairs?

50. Newton’s Third Law
(Action-Reaction)
For every action there is an
equal and opposite reaction.

51. ENGAGE. MARBLE ROLLING
Analyze and Conclude:
1.What do you notice when the marbles
collide?
2.What forces act on the marbles?
3.What is reaction force acting on the
marble?
4. What are the action-reaction pairs?

52. Newton’s Third Law
(Action-Reaction)
“When one object exerts a
force on a second object, the
second one exerts a force on
the first that is equal in
magnitude and opposite in
direction.”

53. Newton’s Third Law of Motion
• Also known as: Action-
Reaction
• “For every action there is an
equal and opposite
reaction.”
• Anytime a force is exerted on
an object, that force is
caused by another object.
Downwards
force
Upwards
reaction

54. Newton’s Third Law of Motion
Downwards
force
Upwards
reaction

55. Newton’s Third Law of Motion
• The reaction of a rocket is an
application of the third law of
motion. Various fuels are burned
in the engine, producing hot gases.
• The hot gases push against the
inside tube of the rocket and
escape out the bottom of the tube.
As the gases move downward, the
rocket moves in the opposite
direction.
Downwards
force
Upwards
reaction

56. Newton’s Third Law
(Action-Reaction)
• There are two forces
resulting from this
interaction - a force on the
chair and a force on your
body. These two forces
are called action and
reaction forces.
Downwards
force
Upwards
reaction

57. Newton’s Third Law
(Action-Reaction)
Examples of
Newton’s 3rd
Law of Motion

58. Newton’s Third Law
(Action-Reaction)
Examples of
Newton’s 3rd
Law of Motion

59. ELABORATE!
COMPLETE THE SENTENCE.
I have learned that:

60. QUIZ. 2 EVALUATE!

61. QUIZ. 3 EVALUATE!

62. Vocabulary
Inertia: the tendency of an object to resist changes in
its state of motion
Acceleration:
•a change in velocity
•a measurement of how quickly an object is
changing speed, direction or both
Velocity: The rate of change of a position along a
straight line with respect to time
Force: Push or pull (strength or energy