Science

1. Force

2. Force
- is defined as push and
pull acting upon an object
as a result of its
interaction with another
object.

3. Force
- expressed in
Newton (N)
- it is a vector quantity
- Force can be
measured using
a spring scale

4. 2 Types of Force
1. Contact Force
- Interacting
objects are
directly touching
2. Non-contact
Force
- Interacting
objects are not
directly touching.

6. NET FORCE
- When two or more forces
are combined

7. NET FORCE
𝑭𝒏𝒆𝒕= 𝑭1 + 𝑭2
= 1050 N + 359 N
= 1409 N to the right or
= 1409 to the east or
= 1409 N
𝑭𝒏𝒆𝒕= 𝑭1 - 𝑭2
=955 N - 560 N
= 395 N to the right or
= 395 N to the east
or
= 395 N

8. Take note that:
1. Forces in the same direction, add the
two forces together and follow the
direction.
2. Forces in different directions, subtract
the two and figure out which direction was
the stronger of the two.

9. F1 = 750 N F2 = 250 N
1.
Let’s Practice
2. F1 = 1000 N
F2 = 350 N

10. F1 = 750 N F2 = 250 N
Fnet = F1 - F2
= 750 N - 250 N
= 500 N to the left
or
= 500 N to the west
or
= 500 N
1.
2. F1 = 1000 N
F2 = 350 N
Fnet = F1 + 350 N
= 1000 N + 350 N
= 1350 N downward
or
= 1350 N to the south
or
= 1350 N

11. Motion

12. Motion
- define as change of position
over time.
- happens when you apply
force.

13. 3 Types of Motion
1. Translational Motion (Straight)
➔ object moves in a straight line
1. Rotatory Motion (Circular)
➔ Object moves about a fixed axis without
changing the radius of its motion
1. Oscillatory Motion (Vibration)
➔ A motion repeating itself is referred to as
periodic

14. Examples

15. How do you know if
something has moved?
- reference point, an indication in
change of position of an object

17. 3 Laws
of
Motion

19. Sir Isaac
Newton
- was an English mathematician,
physicist, astronomer and author
who is widely recognized as one
of the most influential scientists
of all time

20. 1st Law of
Motion
Law of Inertia
An object at rest stays at rest and an
object in motion stays in motion with the
same speed and in the same
direction unless acted upon by an
unbalanced force.

22. Balance and
Unbalanced Force
•A stationary object will not move
while the forces acting on it are
balanced.
•A stationary object will move if the
forces acted upon is unbalanced.

27. One of the most common places people feel the First Law of
Motion is in a fast moving vehicle, such as a car or a bus, that
suddenly stopped. An outside force stops the vehicle, but the
passengers, who have been moving at a high speed, are not
stopped and continue moving at the same speed

28. INERTIA
•tendency of a body to stay at rest when it is
at rest or stay in uniform motion when it is in
motion unless acted upon by an external
force.
MASS is related to the inertia of an object.
The higher the mass the greater the INERTIA
The lower the mass the lesser the INERTIA

30. 2nd LAW OF
MOTION
•Law of Acceleration
Force = mass x acceleration
says that acceleration (gaining speed)
happens when a force acts on a mass (object).
The greater the mass (of the object being
accelerated) the greater the amount of force
needed (to accelerate the object). What does
this mean?

31. Which has a higher
acceleration?

32. Riding a bicycle is a good example of this law
of motion at work. ... When you push on the
pedals, your bicycle accelerates. You are
increasing the speed of the bicycle by applying
force to the pedals.

34. 3rd LAW OF
MOTION
• Law of Interaction
For every action there is an equal
and opposite reaction.

35. Examples

36. Be ready for our
seatwork
tomorrow!
Prepare 1 whole sheet of bond paper.

37. Force
Compute for the following netforce. Show formula, solution and
answer. 2 pts each
Seatwork 10pts

38. 2.
3. 4.
F1 = 369 N F2 = 451 N F1 = 555 N F2 = 275 N
F1 = 1050
N
F2 = 750 N F1 = 650 N F2 = 925 N
5.
F1 = 1650
N
F2 = 850 N

39. Assignment 15pts
Cite one situation for each 3 Laws of Motion.
Explain in not more than 3 sentences each
law.