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 Horsepower =
746 Watts
(To be Continued…)