CBSE Class 11-science Physics Work, Energy and Power
Work and Energy
Work done is a scalar quantity. It can be positive as well as negative. Work done by air friction is always negative.
Work Energy Theorem: The change in kinetic energy of an object is equal to the net work done on it by the net force:
Law of conservation of mechanical energy: Total mechanical energy of the system always remains constant in the absence of dissipative forces.
Work done by Non Conservative force: a) in a round trip ¹ Zero b) depends on the path taken.
Conservative force F = negative of change in PE with respect to change in position. F (x) = - D U/Dx.
Energy and Power
Laws of conservation of energy states that the total amount of energy in the universe or in any isolated system remains constant
Power is the rate at which work is done or energy transformed.
The unit of power is Watt 1 watt = 1joule/second and 1hp = 746 watt
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