**RULE OF UNIVERSAL GRAVITATION NEWTON:**

“The intensity of the force that attracts two bodies depends on their masses and the distance between them”.

That:

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Force, is all that can cause:

*Putting a body in motion*(moving a ball giving it a kick)

*Stop*a body (a goalkeeper who catches the ball)

*Distort*a body (block of dough into dummy)

*Divert*a body (the goalkeeper doesn´t catches the ball, but it changes its course to check that you are not a goal)

When a body left suspended in the air and does not exert any force on it, the body falls vertically to the ground.

This is due to the **terrestrial gravitational force**, ie, the force of attraction exerted by the earth towards its center, over the bodies that are in its vicinity.

We use two laws of the dynamics:

**RULE OF UNIVERSAL GRAVITATION NEWTON:**

“The intensity of the force that attracts two bodies depends on their masses and the distance between them”.

That:

**BASIC LAW OF THE DYNAMICS**

“The force exerted on a body is directly proportional to the aceleration to be announced”.

That:

Galileo Galilei proved that all bodies which are on earth, when released, fall with the same acceleration regardless of their mass since the fall of a body depends on the strenght of gravity.

That:

Equating the two previous findings:

= Thus we see that the gravity change if R varies with latitude an altitude.

What is the variation of "g" at o point at sea level and in the Himalayas?

The information that we know are:

- M = mass of Earth =

- R = radius of Earth(at sea level) =

- G = universal gravitational constant =

Substituting these values into the formula we have obtained, from meters to kilometers:

- At a point
**at sea level**, the force of gravity is:

=

- At one point in the
**Himalaya**(highest mountain on Earth, located in Asia which consists of mountain exceeding 8000 meters in altitude), the force of gravity is:

Now, the radius is: R=6.378 + 0.08=6.386 km and is:

=

So, we can conclude that: the force of gravity decreases as we move away from the center of the Earth.