Physics 2

വർക്ക്, എനർജി, പവർ എന്നീ പ്രധാന ഭാഗങ്ങളാണ് ഇന്നത്തെ പാഠത്തിൽ ഉൾപ്പെടുത്തിയിരിക്കുന്നത്

• Law of Conservation of Energy was put forwarded by

                 Albert Einstein

• The law which states "Energy can neither be created nor be destroyed but can be transformed from one form to another"

                 Law of Conservation of Energy

• Einstein proposed special theory of Relativity in 

                 1905

• Einstein proposed General theory of Relativity in 

                 1915

• Equation mentioning the relation between matter and Energy

                 E=mc²

• A work is said to be done if

                 There is displacement of body in the direction of force applied

• Equation mentioning the relation between Force and Work

                 W=FxD [D: Displacement]

• Ability to do work is called

                 Energy

• CGS unit of work

                 Erg (1 Joule = 107Erg)

• The term Energy was first coined by

                 Thomas Young

• Mechanical Energy of an object is occurred due to

                 Its motion

• Two type of Mechanical Energy of an object is 

                 Potential Energy and Kinetic Energy

• Energy possessed by a body by virtue of its position is called

                 Potential Energy (PE)

• Potential Energy of an object of mass 'm' situated at a height of 'h' above the ground is

                 mgh (g: acceleration due to gravity)

• Energy stored in water reservoir of a dam, in a compressed spring etc are examples of

                 Potential Energy

• Potential Energy of an object at rest on ground is

                 Zero

• Potential Energy increases as the height

                 Increases

• Energy possessed by a body due its motion is called

                 Kinetic Energy (KE)

• Energy changes in a body thrown vertically upwards

                 Potential Energy increases and Kinetic Energy decreases

• Potential Energy of a free falling body is

                 Decreasing

• Kinetic Energy of an object of mass 'm' moving with velocity 'v' is

                 1/2 mv²

• If the velocity of an object is doubled, its Kinetic Energy becomes

                 Four times

• If the mass of a moving object is doubled, its Kinetic Energy becomes

                 Doubled

• A moving stone or moving bullet possesses

                 Kinetic Energy

• Kinetic Energy of an object is always

                 Positive

• Examples of Law of conservation of momentum

                 Rocket propulsion, Jet engine, Fire a pistol etc

• All objects in free fall near the Earth have same

                 Acceleration

• The acceleration of an object in free fall is independent of its

                 Mass

• Highest velocity attainable by an object as it falls through air

                 Terminal Velocity

• An object falls through air will attain its Terminal Velocity when

                 The force of resistance equal to the gravitational pull on the object

• Rate of doing work is known as 

                 Power (P) [Work/Time]

• 1 Watt =

                 1 Joule/Sec

• 1 Horse power =

                 746 Watts
                                                                                                      (To be Continued...)