# Importance of Gravity

#### Academic Questions in PhysicsPlease check out our Test Your Knowledge page to see all Questions and Answers The rate of change of momentum is proportional to the applied force and will take place in the direction of that force. The above statement is attributed to _____. A. Albert Einstein B. Isaac Newton C. Galileo Galilei D. Neils Bohr E. Ernest Rutherford F. Marie Curie The Law of Inertia is also referred to as _____. A. 1st Law of Thermodynamics B. 2nd Law of Thermodynamics C. 3rd Law of Thermodynamics D. Newton's 1st Law of Motion E. Newton's 2nd Law of Motion F. Newton's 3rd Law of Motion The process whereby the velocity of an object increases and decreases over a period of time is best associated with the term _____. A. Speed B. Velocity C. Momentum D. Constant Velocity E. Acceleration F. Average Velocity The rate of motion is best referred to as _____. A. Speed B. Velocity C. Momentum D. Inertia E. Acceleration F. Constant Velocity Consider this expression below: A body X exerts a force FX on another body Y. In return, body Y exert a force FY back on body X. The forces FX and FY are equal in magnitude but opposite in direction. Putting the above expression into equation: FX = -FY Where FX is the action force FY is the reaction Force The above expression relates to _____. A. Theory of Force B. Force Postulate C. Einstein's proposal on Relativity D. Newton's 1st law of motion E. Newton's 2nd law of motion F. Newton's 3rd law of motion The tendency of a body to remain in a state of rest or in uniform motion is referred to as _____. A. Tension B. Uniform acceleration C. Constant acceleration D. Deceleration E. Inertia F. Velocity A change in the position of an object with reference to time is best described as _____. A. Momentum B. Displacement C. Velocity D. Acceleration E. Direction F. Motion The saying 'what goes up on earth must come down' can be best attributed to _____. A. Force B. Motion C. Mass D. Acceleration E. Average velocity F. Constant velocity ### Importance of Gravity:

Let me begin by stating that without gravity, there won't be any form of life on earth.

By definition, gravity is a natural force that pulls (or attracts) a body towards the center of the earth or another physical body having a larger mass (than the body being pulled).

Note: Having a good understanding on the concept of gravity will aid you to easily comprehend its importance. (The importance of gravity may also be considered as functions or effects of gravity).

Below are the importance or functions or effects of gravity:

1. It holds the atmosphere close to earth.

The atmosphere contains oxygen which is utilized by living organisms for respiration. It also contains carbon(IV)oxide used by plant to manufacture food through a process termed photosynthesis.

In addition, the atmosphere protects us from the sun's ultraviolet rays through its ozone layer and green house gases.

2. The sun's gravity holds the earth in its orbit at a distance that will prevent its rays from harming all of earth's inhabitants.

The distance of the earth from the sun is 147.21 million km.

The above distance is neither too close to the sun (to prevent extreme sun rays from harming life on earth) nor too far from it (to prevent extreme cold on earth's inhabitants).

3. Gravity is the reason why we have weights.

Without gravity, we would not be able to stand on earth. In fact, we will become weightless, thus floating in space.

4. Without gravity, there won't be any form of movement on earth.

Means of transportation like cars, trains, ships and airplanes will not work since they will all end up floating in space.

5. The muscles of humans and animals become wasted from a lack of gravity on earth. This is so because movement and locomotion becomes impossible in humans and animals.

6. Without gravity. The earth will have no natural satellite.

Note: The moon is earth's natural satellite and it has got its own force of gravity.

It is the gravity on earth that keeps the moon in it's orbit around earth. This is the cause of ocean tides because the moon's gravity pulls the seas and oceans on earth towards itself.

7. Scientists are of the opinion that gravity is responsible for the formation of new planets and stars in the solar system. Gravity is able to achieve this by pulling together the materials that forms them.

8. The powerful effect of gravity is seen in the formation of black hole.

Think of a black hole as a region (or hole) in space formed by the strong pull of gravitational force to an extent that even light unable to escape through the hole or region.

Note: A black hole attracts so much mass into a small volume (hole) through the powerful effects of gravity such that nothing can pass through the hole (including light). For this reason, it becomes the blackest thing on earth. Alfred Ajibola is a Medical Biochemist, a passionate Academician with over 7 years of experience, a Versatile Writer, a Web Developer, a Cisco Certified Network Associate and a Cisco CyberOps Associate.

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