Gravity

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Gravity

• Written by
• ABDEL DAYEM AL KAHEEL
• www.kaheel7.com
• Prepared by
• Ahmed Adham
• ahmed.adham.eg_at_gmail.com
• Dina Shawky
• dinashawkyeg_at_gmail.com

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Our Agenda

• In this presentation we will demonstrate the
  following points
• The aim of the presentation.
• What is gravity?
• Can we see gravity?
• Feeling the effect of gravity.
• Absence of gravity.
• Gravity around earth.
• Gravity and light.
• Gravity and astronomy.
• Gravity in the religion of Islam.

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What is the aim of this presentation?
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• This presentation has an aim to spread
• culture of the scientific miracle
• in the Qur'an and Sunnah
• to demonstrate the
• Tolerance of Islam
• to prove that this religion is away from
• fanaticism and ignorance.

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What is Gravity?
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Also it is a force that causes things to fall
when they are dropped.The force of gravity
gives things their weight.

• Gravity or gravitation is a natural phenomenon
  by
• which objects with mass attract one another.

• Every object has its own force of gravity.

• Gravity depends on the amount of material that
  
• makes up an object. The more material an object
  has,
• the stronger is its force of gravity. The force
  of gravity
• between two objects decreases as the objects
  get
• farther apart.

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Isaac Newton

• Was the first one to discover the law of gravity
  in the 17th century.

• He stated that any two objects or particles
  having nonzero mass,
• the force of gravity tends to attract them
  toward each other.

• Gravity operates on objects of all sizes, from
  subatomic particles
• to clusters of galaxies. It also operates over
  all distances, no
• matter how small or great.

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Can we see gravity?
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• No, we cant see gravity but
• we can feel it.

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How can we feel the effect of gravity?
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• When a man wants to parachute out of a plane he
  falls down towards the ground because of gravity.

Gravity
Ground
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Also
Against gravity
With gravity
But we feel tired when we ascend up
When we descend down we dont feel tired
Walking on earth is the natural movement
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What happens in case of absence of Gravity?
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Life on earth is impossible without Gravity
A big mess is the only description of our earth
in case of absence of Gravity.
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• Is gravity the same over the surface of the Earth?

No
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• It turns out that in some places you will feel
  slightly heavier than others. The next map will
  show us in exaggerated highs and lows where the
  gravitational field of earth is relatively strong
  and weak.

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• A low spot can be seen just off the coast of
  India, while a relative high occurs in the South
  Pacific Ocean.
• The cause of these irregularities is unknown
  since present surface features do not appear
  dominant.
• Scientists hypothesize that factors that are more
  important lay in deep underground structures and
  may be related to the earth's appearance in the
  distant past.

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Yes

• Is light affected by gravity?

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Light is affected by gravity, but not in its
speed. General relativity gives two effects of
gravity on light.
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• It can bend light (which includes effects such as
  gravitational lensing) by warping space so that
  what the light beam sees as "straight" is not
  straight to an outside observer.

• It can change the energy of light by shifting the
  frequency of the light (gravitational redshift)
  not by changing light speed.

• The speed of light is still constant.

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What about Gravity and astronomy?
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• Astronomers say that all the planets
• have gravity that attracts the nearby bodies and
• the force of gravity is proportional
• to the mass of this planet
• and
• the distance between it and the bodies that it
  attracts

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• So that, all the cosmic bodies like the sun,
  moon, planets, stars, and cosmic dust, etc..
• all have gravitational fields.

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• Earth's gravity keeps the moon on its path
• around the Earth.

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No

• Is the Gravity equal in all planets?

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• The moon has its own gravity, but it is not as
  strong as that of Earth. That is why astronauts
  on the moon can carry equipment that would be too
  heavy to carry on Earth.

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• On Earth, you might be able to jump 3 feet
  (almost 1 meter). On the moon, which has low
  gravity, you might jump 20 feet (6 meters). On
  Jupiter, which has high gravity, you could jump
  only 14 inches (35 centimeters).

On Earth
On Jupiter
On the moon
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An astronaut who finds juggling fruit is easy
without Earth's gravity pulling it down.
Fun in space
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• Therefore the earth has a gravity field that
  attracts people to it and because of this gravity
  the objects are settled on the surface of the
  earth even the atmosphere.

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This means that if there wasn't a gravitational
field for the earth, the atmosphere would have
escaped and faded away in the outer space.
Hence, the gravity is the reason for the
stability of life on earth.
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But, what does religion of Islam say about
Gravity?
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• In the holy Quran Allah refers to this
  phenomenon in clear signs as He Almighty says

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• (Allah, it is He Who has made for you
• the earth as a dwelling place
• and the sky as a canopy, and has given you
• shape and made your shapes good (looking)
• and has provided you with good things.
• That is Allah, your Lord so blessed be
  Allah,
• the Lord of the Âlamîn
• (mankind, jinn and all that exists)).
• Sûrat Ghafir, verse 64

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The explanation of the verse

• Almighty God talks about his graces that He
  bestowed upon his people.
• From these graces that He be exalted made
• the earth settled for its inhabitants
• and made the sky as a canopy.
• He also created mankind in the best shape and He
  provided them with good things.

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The point of inimitability

• Through Gods saying (Allah, it is He Who has
  made for you the earth as a dwelling place), we
  notice that God be He exalted told us about
• the grace of settling the earth and settling
  the objects on its surface.
• And the word (dwelling) refers to the stability
  of creatures on the earth which is an indication
  to the gravity and that is what scientists have
  discovered.

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Allah Almighty Says

• (And on the earth are signs for

those who have Faith with certainty.(
(Sûrat Az-Zariyat- verse 20)
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In the Quran Allah talks to all mankind (Muslims
and non Muslims), for Muslims to increase their
faith and to fix them on Islam and for non
Muslims to guide them to the straight way of
Allah to lead them to heaven where is the
eternity life.
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• Thanks Allah for your Graces

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Sources

• http//kaheel7.com/eng
• http//www.nasa.gov
• http//en.wikipedia.org

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