The document discusses balanced and unbalanced forces, explaining the nature of force as a push or pull resulting from interactions between objects. It categorizes forces into contact forces (like applied and friction) and non-contact forces (such as gravitational and magnetic) and illustrates how these forces affect motion. Additionally, it presents examples and scenarios that demonstrate the principles of net force and its impact on the movement of objects.

1. Balanced
and
Unbalanced
Forces

2. 1. In letter A, is the ball at rest?
2. How can you make the ball move?

3. 3. In letter B, what happens to the ball when you push it with
enough force?
4. In letter C, while it is moving, how can you make the ball stop?

4. 5. In letter D, how can we make the ball change its
direction?

5. is a push or pull upon an
object resulting from the
object's interaction with
another object. Whenever there
is an interaction between two
objects, there is a force upon
each of the objects. When the
interaction ceases, the two
objects no longer experience the
force.
Force

6. Two Types of Forces
1. Contact forces – forces where objects touch or
contact with each other.
Examples:
a. Applied – a force given to a
person or object by another
person or object.
b. Friction – is the force acting
against or opposite an object in
contact with which makes the
movement of the object slow
down.

7. c. Normal – is the force that
acts perpendicular to the
surface of the object in
contact with.
d. Tension – is the force
applied to string, rope, chain
or cable.

8. 2. Non-contact forces – forces where objects do not
touch or contact with each other. These forces act over
a zone or area called field.
Examples:
a. Gravitational (Fg) – is the force
of attraction between two objects.
In the case of the Earth, this
gravitational force causes objects
to fall down to the ground.

9. b. Magnetic– are forces
exerted on a field of
attraction or repulsion as in
the case of magnets and
other magnetic materials.

12. Seatwork #
Identify the situation if it shows balanced or unbalanced force
1. 2. 3. 4.
Pulling of rope Stand still
Tug of war skydiving

13. 6. 7.
8. 9

14. Balanced
Force
Balanced
Force
Unbalanced
Force
Unbalanced
Force
Seatwork #
Identify the situation if it shows balanced or unbalanced force
1. 2. 3. 4.
Pulling of rope Stand still Tug of war skydiving

15. 6. 7.
8. 9
Unbalanced
Force
Unbalanced
Force
Unbalanced
Force
Unbalanced
Force

16. Unbalanced Force
• The Resulting action (net force: smaller arrow to the right of
the = shows that they will change its motion in the direction
of the greater force)
=
5N 10N 5N
• Or, if in a tug or war, one team pulls harder than the other,
the resulting action (net force) will be that the rope will
change its motion in the direction of the force with the
greater strength/magnitude.
=
5N 10N 5N

17. • If the unbalanced forces are exerted in the same
direction, the resulting force (net force) will be the sum of
the forces in the direction the forces are applied.
For Example, the two people full on an object at the
same time in the same direction, the applied force on the
object will be the result of their combined forces
=
5N
10N
15N

18. • When forces act in the same direction, their forces are
added. When forces act in opposite directions, their
forces are subtracted from each other.
• Unbalanced forces also cause a nonmoving object to
change its motion.
• If there is no net force acting on the object, the motion
does not change. If there is net force on an object, the
speed of the object will change in the direction of the
net force.

19. 14N
Unbalanced
Force
10N
Unbalanced
Force
0N
Balanced
Force