**GRAVITY**

By: Albert .A.

By: Albert .A.

What is Gravity?

-Gravity is a natural phenomenon by which physical bodies attract each other with a force, which is proportional to their masses.

-Gravity with mass would attract each other.

-Gravity is also holds the solar systems by using the sun's gravity mass.

-Gravity is a force of attraction that exists between any two masses, bodies or particles.

-With gravity, it holds you and everyone else on the surface of the earth.

-Without gravity, we would float into the atmosphere, along with all the matter on Earth.

What are Gravitons?

-Gravitons are a hypothetical quantum of gravitational energy, which acts like a particle.

-Gravitons that have mass in it emits tiny particles.

-These gravitons are responsible for the gravitional attraction.

-If the gravitons has more mass, it receives more gravitons it would get.

-It would be also considered as a difference in gravitional attraction over distances.

**The Force of Gravity**

-The force of gravity is about 100 kilometres (about 62 miles) above Earth.

-Above Earth is 3% less than the Earth's surface.

-The force of gravity exerted by the gravitional field of a massive object on any body within the vicinity of its surface.

-The force is dependent on three factors:

-The mass of the massive object.

-The mass of the smaller body

-The separation between the two, measured between their geometrical enters.

**Universal Gravitation**

-The Force of gravity would act between two objects.

Example: You (the human) would be attracted to everything else in the universe.

-The strength of the force depends on the masses of the objects.

-Other things that have great mass are the moon and the sun.

-The force of the gravity is also depends on the distance between the objects.

-If the different planets have different mass, that means you would have a different weight in each of them.

Facts about Gravity

To display my learning, I'll tell you

the things I've learned below?

What is Gravity?

With these gravitons, it carries

the binding power of the

gravitational force.

Vicinity

The area near or surrounding a particular place

Exert

Apply or bring to bear (a force, influence, or quality)

Universal Gravitation Weight Finding

-To find your weight, you must use "how many pounds" you are.

-Say you are 106 pounds for an example.

-You must use this table below: (Use the gravitational pull (g))

Mercury: 0.40 Venus: 0.90

Earth: 1.00 Mars: 0.40

Jupiter: 2.50 Saturn: 1.10

Uranus: 0.90 Neptune: 1.20

-Now do this: (106 x what planet you want to find) in order to get your weight

**Universal Gravitation Chart**

Ex: If you were to use 106 as your pounds

Mercury: Your weight

42.4 or 42

Venus: Your weight

95.4 or 95

Mars: Your weight

42.4 or 42

Jupiter: Your weight

265

Saturn: Your weight

116.6 or 117

Uranus: Your weight

95.4 or 95

Neptune: Your weight

127.2 or 127

Let's talk about two of the astronomers or scientists who thought of the theories of gravity

.

Galilei and Newton

Galileo Galilei

-Galileo's work set the stage for the formulation of Newton's theory.

-Galileo realized that a falling body picked up speed at a constant rate (constant acceleration).

-He also made the crucial observation that, if air resistance and buoyancy can be neglected, all bodies fall with the same acceleration, bodies of different weights dropped together reach the ground at the same time.

-Galileo noted that if a ball rolls without interference on a smooth horizontal surface, and friction and air resistance can be neglected, its velocity will remain constant.

-Galileo have dropped a ten pound weight and a one pound weight off the Leaning Tower of Pisa.

http://galileo.phys.virginia.edu/classes/152.mf1i.spring02/DiscoveringGravity.htm

What are Gravitons

The Force of Gravity

Universal Gravitation

Galilei and Newton

-Newton’s law of universal gravitation describes the gravitational attraction between bodies with mass, the earth and the moon.

-Newton’s three laws of motion relate the forces acting on a body to its motion.

-The first is the law of inertia, it states that ‘every object in motion will stay in motion until acted upon by an outside force’.

-The second is commonly stated as ‘force equals mass times acceleration’, or F = ma.

-The third and final law is commonly known as ‘to every action there is an equal and opposite reaction’.

-Newton was known for formulating a theory of gravitation.

-Newton was inspired by watching an apple fall from a tree.

-Newton have made up this own famous formula (F=Gm1m2/r^2). It was used for hundreds of years to describe the (approximate) orbits of the planets around the Sun, and the (approximate) trajectories of things like spacecraft.

-This famous formula was also used to calculate a person's weight on a given planet.

http://www.sciencekids.co.nz/sciencefacts/scientists/isaacnewton.html

http://www.gravityforthemasses.com/Page2.html

Isaac Newton

http://www.sciencekids.co.nz/sciencefacts/gravity.html

Gravity is a gravitional force

where we are able to stay on

the ground, instead of floating

into space.

http://www.exploratorium.edu/ronh/weight/

http://www.wikianswers.com

http://www.jimloy.com/physics/gravity.htm

http://www.universetoday.com/34824/force-of-gravity/

Bibliography

Law of Universal Gravitation

Theory of Gravity

-Tides are caused by the rotation of the Earth and the gravitational effects of the moon.

-Highest known acceleration voluntarily experienced by a human is 46.2g by g-force pioneer John Stapp.

-If you ignore air resistance (drag) then the speed of an object falling to Earth increases by around 9.8 metres per second.

-The human body can handle increased

g-forces as seen in activities such as

dragster races, airplane acrobatics and space training.

More Facts about Gravity

Objects in space not only fall toward the earth, but also sideways or around the earth.

When an object floats on the top of water, gravity is still in play. For an object to float, it must displace enough water to make up the same mass as the object itself.

When one space object revolves around another, it is referred to as an orbit.

We don't actually "feel" gravity. We only feel the effects of trying to overcome it by jumping or when we fall.

Buoyancy

The ability or tendency to float in water or other fluid.

Velocity

The speed of something in a given direction.

Earth: Your weight

106

also...

MrGraw-Hill Ryerson: BC Science 9