Mind Map for Chapter 11 Work and EnergyBy Tejal Physics
Eggonu Venkata Tejal
Created on November 8, 2021
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Transcript
Work and Energy
- Work done on an object is defined as the magnitude of force multiplied by distance moved by the object in the direction of the applied force.
- W = F x s
- If displacement is 0, work done will also be 0.
- Work has only magnitude and no direction
- Work done by a force can be either positive or negative.
Energy
- Kilowatt hour ( kWh )
- Energy used in 1 hour at the rate of 1 kW is called 1 kWh.
- 1 kWh = 3.6 x 106 J
- 1 unit = kWh
- According to the law of conservation of energy , energy can only be transformed from one from to another ; it can neither be created nor destroyed. The total energy before and after the transformation always remains constant.
- K.E + P.E = constant
- Sum of K.E and P.E of an object is its total mechanical energy.
Commercial Unit of energy
- Joule ( J )
- 1 joule = 1 newton x 1 metre
Power
- Rate of doing work or rate of transfer of energy.
- Power = Work / Time
- P = W/t
SI unit
- Defined as the capability to do work.
- Object which does the work loses energy and the object on which the work is done gains energy.
- SI unit : Joule ( J )
- Various forms of energy : mechanical energy, heat energy, chemical energy, electrical energy and light energy.
Law of Conservation of Energy
- Energy possessed by an object by virtue of its position or configuration.
- Gravitational potential energy Work done in raising an object from the ground to a point above the against gravity .
- Potential energy, Ep = mgh
Potential energy ( P.E )
- Forms of energy
Kinetic Energy ( K .E )
- Energy possessed by an object by virtue of its motion.
- Kinetic energy of a body of mass moving with a certain velocity is equal to the work done on it to make it acquire that velocity.
- Kinetic energy Ek = 1/2 mv2