Force is a push or pull that can cause an object to be in motion or change motion. There are different types of forces including contact forces that require touching and non-contact forces that act over a distance. Understanding forces allows you to exert force on objects and know how other forces are involved in a task. It is important to consider forces carefully to handle objects properly.

2. Force is needed to stop an
object.
Force always results to
motion.
Force can act even at a
distance.

3. Objects have the tendency
to remain at rest.
Objects have the tendency
to resist change.

4. S C W P F I R J A I
V S I C C B W E I Y
N O I T C I R F T G
N O T W E N G I R A
J V Z E L N V Z E L
F R P X N A G H N I
V C Y W R S M A I L
G V Z G B X I R M E
C O N T A C T O O O
O G Z X M N B J N N

5. What is the effect of
understanding the
nature of force?

6. Tension –
Contact –
Newton –
Galileo –
Friction –
Gravity –
Normal –
Magnetic –
Inertia -

7.  vector quantity (magnitude
and direction)
 Measured in Newton (N)
 1 N of force is required to give
a 1-kg mass an acceleration of
1 m/s2.
 1 N = 1 kg m/s2

8. 1. Force can make an object
move starting from a rest
position.
2. Force can make a moving
object stop.
3. Force can change the
direction of a moving object.

9. Have you ever felt that that
you are connected to
someone or something
even if there is physical
separation?
What makes you connected?

10.  Contact Forces – forces that
require physical contact between
objects
 Non-Contact Forces – also known
as action-at-a-distance forces or
field forces
- it does not require physical
contact to have any effect on
the other object.

11.  Applied force – a force which is
applied to an object by another
object or by a person. The direction
of the applied force depends on
how the force is applied.
 Normal Force (N)– referred to as
pressing force and is always
directed towards the object and acts
perpendicularly.

12.  Frictional force (f) – opposes the
motion of the object
- results when two surfaces are
pressed together closely, causing
attractive intermolecular forces
between the molecules of the two
different surfaces.
- acts parallel to the surface.
- f=µN (µ=coefficient of friction,
N=Normal force)

13.  Air Resistance Force – a special
type of frictional force
- frequently be ignored due to
its negligible magnitude.
- most noticeable in objects
which travel at high speed or in
objects with large surface
areas.

14.  Tensional force (T) – a force
transmitted through a string,
rope, or wire when pulled tight
by force acting at each end.
- the direction is always away
from the object.

15.  Spring force – the force
exerted by a spring upon any
object which is attached to it.
- acts to restore the object,
which compresses or stretches
a spring, to its ret or
equilibrium position.

16.  Force of Gravity (Weight) – the
force with which the Earth,
moon, or other massive body
attracts an object towards
itself.
- the weight of the object
- W=mg (g=9.8 m/s2,
m=object’s mass (kg))

17. Electrical force – force that
exists between charges
(attractive or repulsive).
Magnetic force – exists in
magnets (attract or repel)

18.  Balanced Forces – are equal
forces acting in opposite
directions; thus, they have
zero net force.

19.  Unbalanced Force – has a
nonzero net force; thus it
produces acceleration.

21.  If you are to exert force on
something, is it important to
get familiar with the other
forces involved?
 How does the knowledge of
the other forces help you in
doing a particular task?

22. How can you show
propriety and cautiousness
in dealing with the different
forces?
How can you relate love to
contact and non-contact
forces?

23. A. Study for a written learning
assessment on Wednesday,
June 18.
Topics:
1. Contact and non-contact
forces and their types.
2. Balanced and unbalanced
forces.

24. B. Bring the following materials
on each date:
June 17,
Wednesday
- 3 Balls of
various sizes
- Glass
- Coins
- sheet of
paper
- straw (Zagu)
June 18,
Thursday
- metal ball of
the shot put
or any two
balls of
different
masses
- toy cart
- string
June 22,
Monday
- Balloon
- 3 meter
length of
nylon string
- plastic straw
- scotch tape