This document discusses different types of forces including balanced and unbalanced forces. It provides examples of balanced forces, such as two equal forces pulling opposite directions resulting in no net force. Examples of unbalanced forces include unequal forces pulling in opposite directions, resulting in a net force. It also discusses how net force is calculated by adding or subtracting forces in the same or opposite directions, and how net force determines if an object's motion will change.
2. Our Father
Who art in heaven,
Hollowed be Thy name,
Thy kingdom come,
Thy will be done
On earth as it is in heaven.
Give us this day our daily bread
and forgive us our trespasses
as we forgive those who
trespass against us,
and lead us not into temptation
but deliver us from evil.
Amen
Opening Prayer
5. •Forces occur in pairs and can be
either balanced or unbalanced
forces.
6. BALANCEDFORCES
- Forces that are equal in magnitude but opposite in direction.
- do not cause a change in motion.
- When balanced forces act on an object at rest, the object will
not move.
- Net Force is equal to 0
7. Fig. 15. A representation of balanced forces in a tug-of-war game
BALANCED FORCES
FA - applied force on the rope by Team A
FB - applied force on the rope by Team B
8. BALANCED FORCES
Fig. 19. A ball pushed on the floor
FN – force exerted by the floor
on the ball
Fg - force exerted by the Earth
on the ball
Ff - opposite force in the
direction of the motion or
frictional force
FAPPLIED – applied force on the ball
9. UNBALANCEDFORCES
-Forces that cause a change in the motion of an
object .
-are not equal and in opposite direction.
-When you push a table and then it moves,
unbalanced forces are present.
10. Fig. 16. A representation of unbalanced force in a tug-of-war game
UNBALANCEDFORCES
17. NET OR RESULTANT FORCE
- is the sum of all forces acting on an object.
zero net force
object is at rest
- the object remains at rest.
object is moving
- the object maintain its velocity at a given time
interval.
18. net force is not zero
- the object’s velocity will change.
object at rest - may cause the object to move.
moving object - a net force will increase its velocity when the force is in
the same direction of its motion.
- If the net force is in the opposite direction of the object’s motion, the
force will reduce the object’s velocity.
- the net force acts sideways on a moving object, the direction of the
object’s velocity changes.
NET OR RESULTANT FORCE
19. Net force
- combining all forces exerted on an object.
•Forces in the same direction
– forces are added to determine the size of the net
force
•Forces in the different direction
- subtract the smaller force from the larger force to
determine the size of the net force
20. Example
• Net force: 6 N
• Change in motion: the box will move to the
left
4 N
2 N 10 N
2 N
Net force:
Change in motion:
14 N
Move to the right
2 N
21. Example
• Net force: 2 N
• Change in motion: the box will move to the
left
4 N
2 N 10 N 10 N
Net force:
Change in motion:
0 N
The box will not
move
22. •Balanced forces
- when a forces on an object produce a net force of 0 N
- there is no change in the motion of the object.
•Unbalanced forces
- when the net force of an object is not 0 N
- produce a change in motion of an object.
24. Balanced
forces
Unbalanced
forces
1. opposite direction 4. equal in size 7. force created by a push or pull
2. can be opposite or same direction 5. no change in motion
3. not equal in size 6. always causes change in motion
1. opposite
direction
7. force created by
a push or pull
4. equal in
size
5. no change in
motion
2. can be opposite
or same direction
3. not equal in
size
6. always causes
change in motion
25. Read and analyze each problem carefully.
1. Boys A and B, are pulling a
heavy cabinet at the same
time with 5 N of force each.
What is the net force acting
on the cabinet?
______________________
10 N
26. 2. What if boy A and boy B pull
the heavy cabinet at the same
time in opposite directions with
10 N and 5 N of force
respectively,
a. what will be the net force on
the cabinet?
______________________
b. will the cabinet move?
______________________
c. to what direction will it move?
______________________
5 N
Yes
to the left
10 N 5 N
-
27. 3. From problem 2, suppose
another boy, Boy C pulls the
heavy cabinet with 5 N of force in
the same direction with Boy A
a. What will be the net force on
the cabinet? __________
b. Will the cabinet move?
______________________
c. In what direction will the
cabinet move?
______________________
10 N
Yes
to the left
10 N 5 N
5 N
30. Calculate the net force and write the direction the
object will move in.
Example:
2 N 4 N
= 2 N (DOWNWARD)
OR -2 N
31. = 5 N
TO THE RIGHT
= 10 N
TO THE LEFT or – 10 N
= 7 N
TO THE RIGHT
= 5 N
TO THE LEFT or – 5 N
= 0 N
at rest
= 4 N
TO THE RIGHT
= 0 N
At rest
= 6 N
TO THE LEFT or – 6 N
= 0 N
at rest
= 0 N
at rest
