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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