Gravitation

Gravitation – Gravitation oftentimes also termed as Gravity is a force which found among all material objects in the universe. For any two objects or particles having non-zero mass, the force of gravity tends to attract them toward each other. Gravity works on objects of all sizes, be these subatomic particles or clusters of galaxies.

Work, Energy and Power

Work - When a force acts upon an object and displaces it from its original position, it is said that work was done upon the object. There associates three key component to work - force, displacement, and reason or source.

Motion

Scalars - Scalars are quantities that are fully described by a magnitude (or numerical value) alone.

Examples of Scalar Quantities - mass, length, temperature, energy, pressure, volume, electric charge, space-time interval, invariant mass

Vectors - Vectors are quantities that are fully described by both a magnitude and a direction.

Name and Symbols of Different Physical Terms, Descriptions and SI Units

Base quantity	Symbol	Description	SI unit
Length	l	The one dimensional extent of an object.	metre (m)
Matter	m	The amount of matter in an object.

Important Physics Discoveries in Chronology Order

• 1687 - Laws of motion and law of gravity: Newton
• 1782 - Conservation of matter: Lavoisier 
• 1785 - Inverse square law for electric charges confirmed: Coulomb 
• 1801 - Wave theory of light: Young

Inventions, Inventor, Country and Year

• Adrenaline: (isolation of) John Jacob Abel, U.S., 1897.
• Aerosol can: Erik Rotheim, Norway, 1926.
• Air brake: George Westinghouse, U.S., 1868.
• Air conditioning: Willis Carrier, U.S., 1911.