WORK:
1. When a body is displaced by applying a force on it then work is to be done.
✔️work is a scalar quantity which has only magnitude no direction.
WORK = FORCE. * DISPLACEMENT
(Scalar) (vector) (vector)
Example: Q) a man move 1M distance by 1N force on it, work done will be= 1Joule.
2. Zero work done by a man standing on a platform holding "n" Kg weight.
Example:Q) if force is zero then the work done? Answer= work is also zero.
3. A man pushes the wall but fails to displace that means absolutely zero work.
4. The product of Force and Displacement is called work.
ENERGY:
1.Efficiency of work is known as Energy.
2. Energy can neither be Created nor Destroyed.
3. SI unit is Joule. & CGS unit is erg.
4. Commercial unit of energy is kilowatt-hour.
5. 1kilowatt =3.6*10^6 Joule.
6. POTENTIAL ENERGY is the stored energy an object has because of its position or state.
PE = mgh
✔️water stored in a dam is potential energy. (Water is following the dam that energy is known as kinetic energy)
✔️A raised hammer have potential energy.
✔️A stretched rubber band has potential energy stored in it.(when it is release then potential energy get converted into kinetic energy)
✔️The potential energy of an object increases with its height.
7. KINETIC ENERGY is the energy that object possess due to their motion.
KE= 1/2mv^2
✔️A moving object essentially receives kinetic energy.
✔️A car running at high speed contain kinetic energy.
✔️kinetic energy always positive value.
✔️when a bullet is fired from a gun is a convert kinetic energy.
✔️kinetic energy is related to an object's momentum.
8. Potential energy and Kinetic energy are the type of Mechanical energy.
POWER:
9. Rate of doing work is called power.
Power = Work / Time.
10. SI unit of Power is Watt.
Physics
Chemistry
Biology
Polity
Geography
History
Current affairs
Miscellaneous
- INDIAN RUPEES
- INDIA'S NATIONAL PARK AND WILDLIFE SANCTUARY
- BOOKS AND AUTHOR PART 1
- BOOKS AND AUTHOR PART 2
- NOBEL PRIZE 2020
- ORGANIZATION AND HEADQUARTER
