Commit fa0f58be by Prasanth yendluru

### updated project

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 WORK AND ENERGY

ANIMATION 1

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ANIMATION 2

FORMS OF ENERGY

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COMMERCIAL UNIT OF POWER

• unit joule is too small and hence is inconvenient to express large quantities of energy. We use a bigger unit of energy called kilowatt hour (kW h).
• 1kWh =1kW*1h
= 1000W×3600s
= 1000W×3600s
= 3600000 J
• 1kWh = 3.6× 106J.
• energy used in households, industries and commercial establishments are usually expressed in kilowatt hour.
• For example, electrical energy used during a month is expressed in terms of ‘units’. Here, 1 ‘unit’ means 1 kilowatt hour.

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ENERGY

• An object having a capability to do work is said to possess energy. The object which does the work loses energy and the object on which the work is done gains energy.
• The unit of energy is, therefore, the same as that of work, that is, joule (J).
• we live in provides energy in many different forms. The various forms include mechanical energy (potential energy + kinetic energy), heat energy, chemical energy, electrical energy and light energy.
• Life is impossible without energy.
• The Sun is the biggest natural source of energy to us.
• We can also get energy from the nuclei of atoms, the interior of the earth, and the tides.
• Examples: when a fast moving cricket ball hits a stationary wicket, the wicket is thrown away
• An object having a capability to do work is said to possess energy. The object which does the work loses energy and the object on which the work is done gains energy.
• An object that possesses energy can exert a force on another object.
• The energy possessed by an object is thus measured in terms of its capacity of doing work.
• The unit of energy is, therefore, the same as that of work, that is, joule (J). /li>
• 1 J is the energy required to do 1 joule of work. Sometimes a larger unit of energy called kilo joule (kJ) is used. 1 kJ equals 1000 J.

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