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THE STORY OF GRAVITY: Copernicus, Galileo, Kepler, Newton, Einstein

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THE STORY OF GRAVITY: Copernicus, Galileo, Kepler, Newton, Einstein

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Copernicus, Galileo, Kepler, Newton, Einstein.

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Galileo died in 1642, the year that Newton was born.

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Galileo died in 1642, the year that Newton was born.

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Galileo’s experiment on the moon in 1971 - feather hammer drop 

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Galileo’s experiment on the moon in 1971 - feather hammer drop 

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Famous Ball-and-Feather Experiment

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Brian Cox visits the world's biggest vacuum | Human Universe - BBC

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Newtons Universal Law of Gravitation - Science in a Minute

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Newton's Law of Universal Gravitation states:

Each body in the universe attracts every other body with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres.

Weight

Weight as the gravitational force the Earth exerts on any object on or near its surface

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WHERE:
F = force
m = mass
r = distance two objects are apart (distance between their centers)
G = Universal gravitational constant (Newton's constant) = 6.67×10⁻¹¹ N m² kg-2

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LORD HENRY CAVENDISH - the man who determined the value for "G"

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LORD HENRY CAVENDISH - the man who determined the value for "G"

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Understanding Universal law of Gravitation!

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Performed in 1797–98 by British scientist Lord Henry Cavendish

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Understanding Universal law of Gravitation!

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Superman's strength must be partly attributed to the gravitational field of his home planet, Krypton.

The people of Krypton evolved to stand, walk, and lift ordinary objects in Krypton's strong gravitational field.

When Superman came to Earth, he found that his Kryptonian physique was over-designed.

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Superman (1978) - West Coast Chaos Scene (810) Movieclips

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Easily create beautiful interactive video lessons for your students you can integrate right into your LMS. Track students' progress with hassle-free analytics as you flip your classroom!

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SIMPLE PROBLEM SOLVING ON UNIVERSAL GRAVITATION

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SIMPLE PROBLEM SOLVING ON UNIVERSAL GRAVITATION

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NEWTON'S LAW OF UNIVERSAL GRAVITATION - Sample Problem - (slide 9)

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Gravity, Universal Gravitation Constant - Gravitational Force Between Earth, Moon & Sun, Physics

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PRACTICE PROBLEM:
Suppose two objects attract each other with a gravitational force of 16 N.

1. If the mass of both objects was tripled and the distance between the objects was doubled, what would be the new force of attraction between the two objects?

2. What is the ratio of the forces  Fnew / Foriginal ?

ANSWER:

1. F new = G(3m x 3M/ (2r)²   =  9GmM /(4 r ²)   =  9/4 F original

2. F new / F original = 9/4

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Physics - Universal Gravitation (Univ of Toronto) PSSC

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GRAVITY - ALICE & BOB - PERIMETER INSTITUTE.mp4

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ELECTROSTATIC VS GRAVITATIONAL FIELDS IN ACTION - BUILD YOUR OWN PARTICLE ACCELERATOR!  

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ELECTROSTATIC VS GRAVITATIONAL FIELDS IN ACTION - BUILD YOUR OWN PARTICLE ACCELERATOR!  

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ANSWERS TO ALL EXAMPLES AND EXERCISE QUESTIONS

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ANSWERS TO ALL EXAMPLES AND EXERCISE QUESTIONS

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6.1
Every particle in the universe attracts every other particle with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres.
6.2
At the point where the gravitational force on Apollo towards Earth is equal to the gravitational force on Apollo towards the Moon, the forces are equal but act in opposite directions and BALANCE. The resultant or net force on Apollo will then be the vector sum of the opposing forces which is zero.

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6.4
In the vacuum of space on a spacewalk (with no air molecules or supportive surfaces), the astronaut is acted upon by the force of gravity only and are in free fall towards Earth (at the acceleration of gravity, together with the spacecraft) but continue to miss the earth. Since the astronaut is therefore in ORBIT he appears weightless.