Understanding Balance-and-Stability powerpoint

!
Opening Prayer
Our Lord God in heaven. Thank you for the new day you've bestowed
upon us. Until this moment, we still have our borrowed life and strength
from you. We worship and praise Your Holy Name.
This moment, we will continue to study and acquire new knowledge. May
you bless your students with witty brain to think fast and an inquiring mind
to be curious on whatever knowledge they will learn today. Most
importantly bless them with Your wisdom and a heart that will follow your
commandments in order for them to become worthy in their studies.
We hope that you heard our prayer.
We ask all of these. In the name of Jesus Christ, our Saviour.
Amen.

Objective for the Week
• Explain an object's stability can be
improved by adding weight (mass) to
points below an objects center of weight
(mass, gravity) and by increasing the
area of its base.

•Balance is your
ability to control
your body without
movement against
gravity.

When an object is
balanced, it is in a
state of equilibrium

•Stability is your
ability to control
your body during
movement.
Example of Stability is the
state of being resistant to
change and not prone to
wild fluctuations in emotion
Emotional stability

• Stability is a measure of how
likely it is for an object to
topple over when pushed or
moved.
• Stable objects are very difficult
to topple over, while unstable
objects topple over very easily.
• An object will topple over if its
centre of gravity is 'outside'
the base, or edge, on which it
balances.

What determines a
structure’s
stability?

•The concepts and
principles in statics are
applied in the
architectural designs of
the arches, walls, or
foundations of houses,
buildings, bridges, and
dams in order to
optimize these
structures stability.

•Aside from the use of
sturdy materials for
their construction,
the forces acting on
these structures must
be balances so that
they will maintain a
static equilibrium

3 PARTS TO
STABILITY
1.COG
2.BOS
3.LOG

• Since matter is made up of
tiny particles that have
mass, each of these
particles has weight. The
sum of the weights of all
the particles of an object is
concentrated at one point.
This point is called the
center of gravity (COG).
The center of gravity of an object can
be represented using dot.

• The position of the
centre of gravity of an
object affects its
stability.
• The lower the centre of
gravity (COG) is, the
more stable the object.
• The higher it is the
more likely the object is
to topple over if it is
pushed.

Center of Gravity for Uniform
Objects
•Uniform objects are those
that have regular shapes.
The center of gravity of
these objects is at their
geometric centers.
Figure shows the CG of a cube
and a cylinder.
CG
CG

Center of Gravity for Nonuniform Objects
•Non-uniform objects
are those that have
irregular shapes. The
center of gravity of a
non-uniform object
may be determined
by hanging and
balancing it or by
using the plumb line
method.

Center of Gravity for Nonuniform Objects
•To find the CG by
hanging and balancing,
tie a piece of string or
wire to suspend the
object as shown in the
figure

Where is the
center of
gravity of the
two persons?

•The base of support has
been defined as the
horizontal stride width
during the double-support
phase when both feet are
in contact with the ground
and the whole-body
center of gravity (CG)
remains within the BOS

Increasing the area of the base will also increase the stability of
an object, the bigger the area the more stable the object.

•Muscles are used
extensively to balance
the body in the front-
to-back direction.
•While bending in the
manner shown,
stability is increased
by lowering the center
of gravity.
•Stability is also
increased if the base is
expanded by placing
the feet farther apart.

Which do you think is the safest
stool to use in a laboratory?

• The effect of size of the base
is shown by the three stools.
• The centres of gravity of all
the stools are the same
height above the ground but
because stool (c) has a
much smaller base it topples
over if they are all tilted to
the same angle while the
other two stools return to a
level position.
• Notice that the centre of
gravity is not inside the
material of the stool.

• Line Of Gravity (LOG)is an
imaginary vertical line from
the centre of gravity to the
ground or surface the
object or person.It is the
direction that gravity is
acting upon the person or
object.
• It is also known as the line
of action of the force of
gravity. In the image above you can see the line of
gravity in red going down to the ground
from the centre of gravity, indicating the
force of gravity upon the sprinter.

• The closer the line of
gravity is to the centre of
the base of support the
better balanced a person is
in this position.
• If the line of gravity fall
outside of the base of
support the person must
provide corrective muscle
action, usually a movement
otherwise they will fall.
• In the given picture in
which direction should the
player move?

• It is one thing to have a system in equilibrium; it is quite
another for it to be stable.
• If an object is in equilibrium, it is balanced, then if a force is
applied to the object it will either tilt, tip over or roll.
These three conditions are known as:
(a)stable equilibrium (it tilts and then falls
back to the original position)
(b) unstable equilibrium (it tilts and then falls
over)
(c)neutral equilibrium (it rolls)

Let us take this marble
as an example

If the body neither returns
to its original position nor
increases its
displacement further, it
will simply adopt its new
position.

If the body does not
return to its original
position but moves
further from it.

If the body returns to
its original position by
retaining the originally
vertical axis as vertical.

What I have learned about the lesson?

How balance and stability is
important in performing
activities especially in sports?

Evaluation: Identify what is asked in the following
statement.
___________1. It is an imaginary vertical line from the center of
gravity to the ground or surface the object or person.
___________2. The center of gravity of these object may be
determined by hanging and balancing it.
___________3. It is a measure of how likely it is for an object to
topple over when pushed or moved.
__________4. It defined as the horizontal stride width during the
double-support phase when both feet are in contact with the
ground.
___________5. It is your ability to control your body without
movement against gravity.

!
Closing Prayer
We thank you Lord, for allowing us to end this class successfully.
We thank you for letting us share and interact meaningfully with each other
online.
We may not be together physically but through your blessing, we were able to
learn and advance our knowledge and skills.
Grant that we continue to pursue our education despite the problems that come
our way.
May you allow us to gain more information that we could use to serve other
people.
May you send the Holy Spirit to guide us in sharing this information to the world.
We pray for the safety of the teachers, students, families, and all people in the
world.
We ask all these, in your powerful name.
Amen

Understanding Balance-and-Stability powerpoint

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