Physics

Importance of Gravity

len Alfred Ajibola - Tue, 17th December, 2019 @ 21:25: PM

Topics in Physics

Derived Units: Similarities and Differences with Fundamental Units Gravity: Interesting facts on Gravity Relative Density of Substances and Specific Gravity Types of Heat Transfer: Conduction Types of Heat Transfer: Convection Types of Heat Transfer: Radiation Physics Scheme of Work, SS1, First Term Physics Scheme of Work, SS1, Second Term Physics Scheme of Work, SS1, Third Term Velocity and Acceleration Newton's Laws of Motion Importance of Gravity What is Density? Density of various Substances Concepts of Force and Motion Motion and Speed Concept of Heat Transfer Concepts of Heat and Temperature Gravity: What is Gravity? Zeroth Law of Thermodynamics - Thermal Equilibrium Fundamental Quantities and Units in Physics


Academic Questions in Physics

Please 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

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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).

Please read on the Concept of Gravity here.

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.

Please read on Photosynthesis here.

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

Please read on the Functions of the Atmosphere here.


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.

Please read on the Planets of the Solar System and their Characteristics here.

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.

Please read on Mass versus Weight here.


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.

Please read on the Means and Modes of Transportation here.


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.

Please read on Amazing Facts in Biology here.


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.

Please read on the Solar System here.


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.

Please read on Types of Planets and their Characteristics here.


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.

You can read on Matter here.

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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

Glass Ball - Len Academy

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/s2.

Please read on gravity here

When two metals are put together in space, they will stick together as if they are welded. This phenomenon is called cold welding

The fastest animal on land is Cheetah. It can reach a maximum speed of about 113km per hour.

Please read on motion, speed, velocity and acceeration here


NOTABLE POINTS IN Physics

The Classical Mechanics (Laws of Motion) is a fundamental part of Physics.

Below are the Newton's Laws of Motion:

An object at rest will continue in its state of rest; while an object in uniform motion will continue in a straight line, unless an external force acts on it.

Newton's First Law of Motion.

Please read on Motion and Speed here.

The rate of change of momemtum is proportional to the applied force and will take place in the direction of that force.

Newton's Second Law of Motion.

To every action, there is an equal and opposite reaction.

Newton's Third Law of Motion.

Please read on Newton's Laws of Motion here.

The study of Thermodynamics revolves around the relationship between heat, temperature, energy and mechanical work; and these can be summarised under the 4 laws of Thermodynamics (Numbered zero through three).

You can read on the Concepts of Heat and Temperature here.

Below are the 4 laws of thermodynamics:

Zeroth law of thermodynamics – If two thermodynamic systems are each in thermal equilibrium with a third, then they are in thermal equilibrium with each other.

Please read on the Zeroth Law of Thermodynamics here.

1st law of thermodynamics – Energy can neither be created nor destroyed but can be changed from one form to another.

You can read on the Food Chain here.

2nd law of thermodynamics – The entropy of an isolated system not in equilibrium will tend to increase over time, approaching a maximum value at equilibrium.

3rd law of thermodynamics – As temperature approaches absolute zero, the entropy of a system approaches a constant minimum.

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 or 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