flying & floating

1. FLOATING & FLYING
This section of Physics deals with the following
areas of concentrations and considerations
which will explain the naturally occurring
phenomena and principles of the following
common cites and situations we can observe in
our daily living.
They are:
- effects of fluids on objects…
- what makes objects float or fly…
- why can insects walk on fluids like water…
- why do liquids overflow…

2. FLOATING & FLYING…
In the different discussions that we have,
additional tricky yet possible questions could be
asked such as:
* Why do boats float while a coin sinks in water?
* Why do objects weigh less in water than in air?
* What make balloons go up?
* How do airplanes fly?

3. FLOATING & FLYING…
* Matter – is anything that occupies space has
mass and volume.
* Matter exists in four different phases:
1. Solids 2. Liquids 3. Gases 4. Plasma
Liquids and gases can be referred as FLUIDS.
Fluids are characterized of being viscous; or
has the ability to flow and fall due to the
earth’s gravitational pull. Next>

4. FLOATING & FLYING…
Solids
very compact
molecules
do not have
the space
to move
freely.
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5. FLOATING & FLYING…
slightly
compact
*molecules
only have a
narrow
space to
move
freely.
Liquid
s
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6. FLOATING & FLYING…
uncompact
*molecules
have
enough
space to
move
freely.
Gases
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7. FLOATING & FLYING…
We are surrounded by air and water, also
known as fluids. We live and breathe air from
the atmosphere. We drink and swim in water.
The properties of fluids enable boats to float in
water, the submarine to float or submerged in
water, balloons to float in air, and airplanes to
fly.
These are all possible due to the presence of
the FORCES OF FLUIDS.

8. FLOATING & FLYING…
Pressure (P) is a perpendicular force acting on
a surface.
Force (F) F
Pressure = ------------ or P = ----
Area (A) A
Arrows represent
forces that act
perpendicular to
the surface of the
cube (box)

9. FLOATING & FLYING…
Pressure can be classified into:
1. Solid pressure
2. Liquid pressure
3. Gas pressure
Liquid & gas pressure can be referred to as
FLUID PRESSURE.
Solid pressure is characterized by solid objects
due to the surface in contact with another
surface.

10. FLOATING & FLYING…
Force (F) F
Pressure = ------------ or P = ----
Area (A) A
In units,
* Force is in Newton (N)
* Area is in Square Meter (sq.m or m2
)
thus, pressure can be quantified as…
Pressure = N/m2
or Pascal (Pa)

11. FLOATING & FLYING…
The unit Pascal (Pa) was derived and named
after the honor of Blaise Pascal – a scientist
who conducted studies on fluid pressure.
1 Pa = 1 N/m2
One of the best example of pressures is…
atmospheric pressure (atm).
Atmospheric pressure is the pressure of air in
the atmosphere which is acting and is exerting
on us under.

12. FLOATING & FLYING…
For example:
*Suppose the force exerted by the air on the
face of cube is 8820 N. Each side of the cube
measures 10 cm. Compute the pressure on
each cube’s face.
Here is the process:
P = F/A Given: F = 8820N
side = 10 cm. Area = s2
P = 8820N / (0.1 m)2
P = 882000 N/m2

13. FLOATING & FLYING…
Solve this:
*Suppose the force exerted by the air on the
face of cube is 10,000 N. Each side of the cube
measures 100 cm. Compute the pressure on
each cube’s face.
Here is the process:
P = F/A Given: F = 10,000 N
side = 100 cm. Area = 1m2
P = 10000 N / (1 m)2
P = 10,000 N/m2