Topics
Gravitation
Periodic Classification of Elements
- Types of Element: Metals
- Dobereiner’s Triads
- Newland's Law of Octaves
- Mendeleev’s Periodic Table
- Merits and Demerits of Mendeleev’s Periodic Table
- Merits and Demerits of Mendeleev’s Periodic Table
- Modern Periodic Law
- The Modern Periodic Table
- Position of Element in the Modern Periodic Table
- Modern Periodic Table and Electronic Configuration of Elements
- Groups and Electronic Configuration
- Periods and Electronic Configuration
- Periodic Properties
- Atomic Size
- Metallic- Nonmetallic Character
- Gradation in Halogen Family
Chemical Reactions and Equations
- Classification of Change: Chemical Changes
- Chemical Equation
- Chemical Equation
- Chemical Equation
- Chemical Equation
- Types of Chemical Reactions
- Direct Combination (or Synthesis)
- Decomposition Reactions
- Single Displacement Reactions
- Double Displacement Reaction
- Endothermic and Exothermic Processes
- Endothermic and Exothermic Reactions
- Rate of Chemical Reaction
- Factors Affecting the Rate of a Chemical Reaction
- Oxidation and Reduction
- Corrosion of Metals and Its Prevention
- Concept of Rancidity
Effects of Electric Current
- Energy Transfer in an Electric Circuit
- Heating Effect of Electric Current
- Magnetic Effect of Electric Current
- Magnetic Field Due to a Current Through a Circular Loop
- Magnetic Field Due to a Current in a Solenoid
- Force on a Current Carrying Conductor in a Magnetic Field
- Fleming’s left hand rule
- Electric Motor
- Electromagnetic Induction
- Galvanometer
- Faraday's Laws of Electromagnetic Induction
- Fleming’s Right Hand Rule
- Types of current: Alternating Current (A.C.) and Direct Current (D.C.)
- Alternating Current (A.C.) Generator
- Direct Current Motor
Heat
Refraction of Light
Lenses
- Lenses
- Concave Lens
- Sign Convention for Spherical Lenses
- Magnification of a Lens
- Power of a Lens
- Combination of Lenses
- Human Eye: Structure of the Eye
- Eye Defect and Its Correction: Myopia Or Near-sightedness
- Eye Defect and Its Correction: Myopia Or Near-sightedness
- Eye Defect and its correction: Hypermetropia or far-sightedness
- Eye Defect and Its Correction: Presbyopia
- Concave Lens
- Convex Lens
- Persistence of Vision
Metallurgy
- Types of Elements: Non-metal
- Types of Elements: Non-metal
- Types of Element: Metals
- Equations for Reactions of Metals and Non-metals (S, C, P, Na, K, Ca, Mg) with O
- Reactivity Series of Metals
- Formation and Properties of Ionic Compounds
- Types of Element: Metals
- Basic Principles of Metallurgy
- Types of Separation Or Concentration of an Ore
- Extraction of Metals from Ore
- Refining of Metals
- Corrosion of Metals and Its Prevention
- Corrosion of Metals and Its Prevention
Carbon Compounds
- Bonding in Carbon - Covalent Bond
- Functional Groups in Carbon Compounds
- Homologous Series of Carbon Compound
- Nomenclature of Carbon Compounds
- Iupac Nomenclature System
- Chemical Properties of Carbon Compound
- Chemical Properties of Carbon Compound
- Chemical Properties of Carbon Compound
- Chemical Properties of Carbon Compound
- Ethanol
- Ethanol
- Ethanoic Acid
- Macro Molecules and Polymers
Space Missions
- Space Missions
- Satellites
- Orbits of Artificial Satellites
- High Earth Orbits : (Height from the earth’s surface > 35780 km)
- Medium Earth Orbit (height above the earth’s surface 2000 km to 35780 km)
- Low Earth Orbits (height above the earth’s surface: 180 km to 2000 km)
- Launching of Satellite
- Space Missions Away from Earth
- Moon Missions
- India’s Space Programmes: Mangalyaan (Mars vehicle)
- Missions to Other Planets
- India and Space Technology
- Space Debris and Its Management
School of Elements
The Magic of Chemical Reactions
The Acid Base Chemistry
- Chemical Properties of Acids and Bases
- Strength of Acidic Or Basic Solutions
- Strength of Acidic Or Basic Solutions
- Acids, Bases and Their Reactivity
- Acid Or a Base in a Water Solution
- Preparation and Uses of Baking Soda
- Preparation and Uses of Bleaching Powder
- Preparation and Uses of Washing Soda
- Preparation and Uses of Plaster of Paris
- Chemicals from Common Salt - Soap as a Salt
The Electric Spark
All about Electromagnetism
- Magnetic Force
- The Bar Magnet
- Magnetic Field Due to a Current carrying Straight Conductor
- Right-Hand Thumb Rule
- Magnetic Field Due to a Current Through a Circular Loop
- Magnetic Field Due to a Current in a Solenoid
- Force on a Current Carrying Conductor in a Magnetic Field
- Fleming’s Left Hand Rule
- Electric Motor
- Electromagnetic Induction
- Alternating Current (A.C.) Generator
- Direct Current Motor
- Domestic Electric Circuits
Wonders of Light 1
- Spherical Mirrors
- Concave Mirror
- Concave Mirror
- Sign Convention for Reflection by Spherical Mirrors
- Linear Magnification (M) Due to Spherical Mirrors
- Refraction by Spherical Lenses
- Convex Lens
- Convex Lens
- Sign Convention for Spherical Lenses
- Magnification of a Lens
- Power of a Lens
- Human Eye: Structure of the Eye
- Eye Defect and Its Correction: Myopia Or Near-sightedness
- Applications of Spherical Mirrors and Lenses
Wonders of Light 2
Striving for better Environment 1
description
notes
Free Fall:
Whenever objects fall towards the earth under this force alone, we say that the objects are in free fall. Is there any Whenever objects fall towards the earth under this force alone, we say that the objects are in free fall. Is there any But due to the earth’s attraction, there will be a change in the magnitude of the velocity. Any change in velocity involves acceleration. Whenever an object falls towards the earth, an acceleration is involved. This acceleration is due to the earth’s gravitational force. Therefore, this acceleration is called the acceleration due to the gravitational force of the earth (or acceleration due to gravity). It is denoted by g. The unit of g is the same as that of acceleration, that is, ms–2.
As
F = ma (`because`a = g) ...(1)
F = mg ...(2)
and `"F" = "G"("Mm")/"d"^2` (`therefore` Universal law of gravitation) ...(3)
From (ii) and (iii)
`therefore` `"mg" = "G"("Mm")/"d"^2`
`therefore` `"g" = "GM"/"d"^2`
M = Mass of the earth.
d = Distance between the object and the earth.
G = Gravitational constant
If the object is placed on the earth then d = R (radius of the earth)
`therefore` `"g" = "GM"/"R"^2`
Earth is not a sphere it is flattened at poles.
Hence Rp - Radius at pole and Re - Radius at equator Re > Rp
`"g" ∝ 1/"R"`
`therefore` The value of 'g' is more at poles = (9.9 m/s2) and less at the equator = (9.8 m/s2)