LESSON 1 GRADE 8 SCIENCE.pptx

BALANCED AND
UNBALANCED
FORCES
KELLY JEAN P. ROS
T-I

Q1a. What does the word balance mean in everyday
terms?
When something is stable.
Equal.
Not falling over.

Q1b. What does the word force mean in everyday
terms?
 To break something open, like to
force a door open;
 A (force) field,
 A push or a pull;
 Something that makes things move
(accelerate) – like a magnet pulling
a metal toy.

Q2. What does balance mean in scientific terms
when we are referring to forces?
The forces are the same.
The forces are cancelling each other
out;
One force counteracts the other.

Q3. How could you illustrate or represent
balanced forces? (You can use words, symbols,
or drawings.)
some possible representations: , ,
, , ↔ , ± .
Others could include: A seesaw; A
balance beam for gymnastics; Pushing
the palms of your hands together; or
Standing on one foot, etc.

The lesson is about balanced and
unbalanced forces and how forces
can affect the way an object
moves.

The lesson may also help student to
be better at using symbols to
communicate information in
science.

Component 3:
LESSON
LANGUAGE
PRACTICE

Force
Same direction
Opposite direction
Cancel
Representations
Situations

Component 4A
Balance and Forces
Here are two statements about forces and balance:
1. Equal forces acting in opposite directions in the
same line cancel each other and are described as
being ‘in balance’.
2. The movement of objects is changed if the forces
acting on them are not ‘in balance’.

Component 4B
Q1. What does Equal forces mean?
The same sized forces – two or more.

• They could start moving from being still (i.e.,
accelerate).
• They could speed up (i.e., accelerate).
• They could slow down (i.e., accelerate).
• They could change direction (i.e., accelerate).
• They could stop moving.
Q2. What are some ways that the
motion of objects might be changed?

Q3. What needs to happen for a force to change an
object’s motion?
 If an object is still, you would need to apply a
force to it to make it move (like push it or pull it).
 If an object is moving, you could apply a force to
it to make it slow down, to make it change
direction, or to make it go faster.

Component 4C
Q1. The stimulus shows four ways to
represent forces using symbols. Which
situations are representing balanced
forces?
Situation 1 and Situation 4

Q2. Assuming the square objects are the same size
and mass (weight), what do you predict would be
the movement of the objects in each situation when
the forces represented were applied to the objects?
• The object in situation 1 will not move.
• The object in situation 2 will move to the right.
• The object in situation 3 will move to the left.
• The object in situation 4 will not move.

Q3. Write a general statement that describes the
relationship between forces and the motion of an
object?
• If the forces acting on an object are balanced,
the object will not move., or
• If the forces acting on an object are
unbalanced, the object will move.,

Component 5:
LESSON
CONCLUSION

1. What did you learn from this lesson?
2. What are some things you enjoyed about the lesson?
3. What is something you would like to learn more about
in this topic?

MARS
Here you could
describe the topic of
the section
MERCURY
Here you could
the section
JUPITER
Here you could
the section
02 03

WHOA
This could be the part of the
presentation where you can introduce
yourself, write your email...

—SOMEONE FAMOUS
“This is a quote, words full of wisdom that
someone important said and can make the
reader get inspired.”

INTRODUCTIO
N
Mercury is the closest planet to the Sun and
the smallest one in the Solar System—it’s
only a bit larger than the Moon. It was named
after a Roman god

COMPANY
You can enter a subtitle here if
you need it
01

Do you know what helps you make your point
clear? Lists like this one:
● They’re simple
● You can organize your ideas clearly
● You’ll never forget to buy milk!
And the most important thing: the audience
won’t miss the point of your presentation
THE SLIDE TITLE GOES HERE!

MAYBE YOU NEED TO DIVIDE THE CONTENT
MERCURY VENUS
Venus has a beautiful name and is
the second planet from the Sun. It’s
terribly hot
Mercury is the closest planet to the
Sun and the smallest one in the
Solar System

YOU COULD USE THREE COLUMNS, WHY NOT?
JUPITER
It’s a gas giant and the
biggest planet in the
Solar System
MARS
Despite being red,
Mars is actually a very
cold place
SATURN
It’s a gas giant,
composed mostly of
hydrogen and helium

A PICTURE
ALWAYS
REINFORCES THE
CONCEPT
Images reveal large amounts
of data, so remember: use an
image instead of a long text

A PICTURE IS
WORTH A
THOUSAND
WORDS

DO YOU NEED A GRAPH?
Venus has a beautiful
name, but it’s terribly
Mercury is the closest
planet to the Sun
To modify this graph, click on it, follow the link,
change the data and paste the new graph here

SOMETIMES, REVIEWING CONCEPTS IS A GOOD
IDEA
MERCURY
planet to the Sun
VENUS
name, but it’s terribly hot
JUPITER
It’s the biggest planet in
the Solar System
SATURN
Saturn is the ringed one
and a gas giant
MARS
Despite being red, Mars
is a cold place
NEPTUNE
Neptune is the farthest
planet from the Sun

INFOGRAPHICS MAKE YOUR IDEA
UNDERSTANDABLE...
SATURN
Saturn is the ringed
one and a gas giant
NEPTUNE
Neptune is the
farthest planet
MARS
Mars is actually a
very cold place
JUPITER
It’s the biggest planet
of them all

...AND THE SAME GOES FOR TABLES
MASS
(earths)
DIAMETER
(earths)
SURFACE
GRAVITY
(earths)
MERCURY 0.06 0.38 0.38
MARS 0.11 0.53 0.38
SATURN 95.2 9.4 1.16

THIS IS A MAP
MARS
is a cold place
MERCURY
planet to the Sun

A TIMELINE ALWAYS WORKS WELL
DAY 1
Mercury is the
closest planet to
the Sun
Jupiter is the
biggest planet
of them all
Despite being
red, Mars is a
cold place
Venus has a
beautiful name,
but it’s very hot
DAY 2 DAY 3 DAY 4

4,498,300,000
Big numbers catch your audience’s attention

333,000.00
earths is the Sun’s mass
24h 37m 23s
is Jupiter’s rotation period
386,000 km
is the distance between Earth and the Moon

OUR TEAM
You can replace the image
on the screen with your own
JENNA DOE HELENA JAMES
on the screen with your own

YOU COULD USE FOUR COLUMNS, WHY NOT?
MERCURY
planet to the Sun
VENUS
name, but it’s terribly hot
MARS
is a cold place
JUPITER
It’s the biggest planet in
the Solar System

MERCURY
02
you need it

PROGRESS
name, but it’s hot
planet to the Sun
To modify this graph, click on it, follow the link,
change the data and paste the new graph here
70%
30%

IDENTIFYING INFORMATION
SATURN
Saturn is the ringed one
and a gas giant
20%
MERCURY
planet to the Sun
50%

WHAT ABOUT THESE PERCENTAGES?
20%
Despite being red,
Mars ir a cold place
MARS
50%
Saturn is the ringed
one and a gas giant
SATURN
75%
It’s the smallest planet
in the Solar System
MERCURY

JUPITER
03
you need it

DESKTOP SOFTWARE
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own work. Just delete this
one, add yours and center
it properly

TABLET APP
it properly

MOBILE WEB
it properly

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