Physics

Gravity explained with some fun facts

Alfred Ajibola - Thu, 18th April, 2019 @ 11:26: AM

Topics in Physics

Density and Specific Gravity Force and Motion - Newton's Laws of Motion Motion, Speed, Velocity and Acceleration Heat Transfer, Conduction, Convection and Radiation Concept of Heat and Temperature Gravity explained with some fun facts Zeroth Law of Thermodynamics - Thermal Equilibrium Fundamental Units, Derived Units; Similarities and Differences between Fundamental and Derived Units Physics - Basic and Fundamental Physics Concepts



Academic Questions in Physics

Please check out our Test Your Knowledge page to see all Questions and Answers

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

We have _____ laws of Thermodynamics.

  • A. 1
  • B. 2
  • C. 3
  • D. 4
  • E. 5
  • D. 6

What is Gravity?

Before we look into the fun facts of gravity, I think it's is great idea for us to first understand what gravity really is?

Gravity is a force of attraction.

The exact reason why it’s pulling all things is yet to be ascertained by scientists.

Think of Gravity like a magnet trying to pull together anything that has mass.

Recall that mass is the quantity of matter a body has.

The earth is governed by the force of gravity and that’s why everything present on earth (humans, plants, animals and even air) is always drawn towards it.

Note: Gravity holds the air we breathe towards earth. As you move away from the earth, the air becomes thinner until it vanishes. This is why astronauts wear oxygen mask when they are in space.

Please read on the Layers of the Atmosphere here

You will actually need some form of force larger than gravity in order to pull yourself away from the earth. For instance, the earth as we know is spherical in shape and held in space. All humans live on earth and not inside the earth. Since we live on a spherical earth held in space, how come humans are yet to fall off the constantly rotating earth?

Please recall that the earth rotates round its axis and yet humans don't fall off it.

Well, the answer is GRAVITY. Even if we attempt to jump off the earth into space, the force of gravity present on earth will still pull us down. In fact, in order to leave the earth; there has to be a force stronger that gravity; which must be applied to whatever is attempting to leave the earth. For this reason:

whenever one jumps, a certain amount of force is needed to be applied by that person; but gravity still brings such person back to earth because the applied force had been exhausted.

Planes and jets leave the earth and remain in the atmosphere simply because force is constantly applied to it and this force is always stronger than gravity throughout its flight.

Please read on Motion and Forces here

The earth has got one natural satellite (that's the moon) and many artificial satellites

Think of a satellite as either a machine or moon or planet that revolves around a larger body.

Note: The earth is also a satellite because it revolves round the sun.

The earth's satellites constantly revolves around the earth because the earth constantly draws them closer to itself via the force of gravity. Even the moon has its own force of gravity. In short, everything on the universe has gravity and that’s why they are all held in space. This will include all the planets, the moon, sun, stars and so on.

Please read on the Solar System here

The larger the size of an object, the greater it’s force of gravity. Gravity is affected by the size and closeness of objects. Since the earth is larger than the moon, it will have a greater gravitational force than the moon. We will be more attracted on the earth than we would on the moon if we were astronauts on the moon. This imply that we will weigh different on both places because weight varies (it depends on the degree at which the gravity on earth or moon or another planet pulls us).

Please read on Matter, Mass and Weight here

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Note: The Mass of any object or body will always remain the same (constant since it’s the quantity of matter in us; and it has nothing to do with Gravity.

We can escape earth’s gravitation pull by travelling far away from the earth into space. Since the space is somewhat empty and has no gravity, we will end up floating in it.

Note: It is not compulsory that the force of gravity must pull everything into contacting themselves. It can also bring objects close and not necessarily into contact. For instance the moon, sun, stars and other planets does not make contact with the earth but rather, they have varying proximity to it as a result of gravity.

Other planets have their moons revolve around them and this is also a result of gravity that exists between these planets and their respective moons.

The scientists Sir Isaac Newton and Albert Einstein have been credited with their insight and explanation of gravity.

 

Now that we have some understanding of gravity, below are some facts concerning gravity.

Your weight changes as you travel away from the earth.

The human body begins to malfunction when gravity is not present. This will result because we will begin to float in the absence of gravity, thus resulting in weaker muscles and bones since they are not utilized.

Please read more on Bones here

In a vacuum (a space completely empty of matter), if you dropped a ball and a feather simultaneously from the same height, they will both land at the exact same time as a result of gravity.

Gravity therefore moves all things at the same rate provided the environment has no matter in it.

If we dig the earth until we get into its center, we will have no weight as a result of lack of gravity.

Although the earth rotates and we are on it, we will not fall off it.

Sir Isaac Newton was not hit by an apple as shown in many pictures. (He only pondered if the force that made apples fall actually involves the movement of the moon around the earth).

The force of gravity is actually the weakest force among the four forces that govern the universe; the others being Electromagnetism, Strong Nuclear Force and Weak Nuclear Force.

Spinning an object can create artificial gravity.

You will weigh more on Jupiter than on earth because of its size. (The bigger the size, the larger the force of gravity).


len

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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Amazing facts in Physics

Image Credit: Ball and Roller Store

Glass Balls actually bounce higher than Rubber Balls

Every planet has its own unique gravitational force, for instance, Mars has a gravity of 3.711 m/s2 while earth’s gravitational force is 9.807m/s2Please read on gravity here


NOTABLE POINTS IN Physics

Fuses are present in many electrical devices. They are basically 🔥 fire-breakers 🔥

If there is a power surge, the fuse will break, preventing damage to the electrical devices. It will also prevent the incidence of 🔥 fire🔥 on/from such device.

Physics is one of the core sciences.

Physics is defined the scientific study of matter and the movement of matter through the space and time of the universe.

Understanding the basic and fundamental concepts of physics will help you better comprehend this subject. Below are some of the concepts:

  1. The Laws of Motion (Classical Mechanics)
  2. Electromagnetism
  3. Relativity
  4. Thermodynamics

Please read on the basic introduction of the above physics concept here

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