(a) State law of conservation of energy. (b) Establish the relation between SI unit of energy and commercial unit of energy


#1

(a) State law of conservation of energy.
(b) Establish the relation between SI unit of energy and commercial unit of energy.
© A toy car is displaced through 5 m on application of a force of 7 N. Let us take it that the force acts on the object through the displacement. What is the work done in this case?


#2

Energy can neither be created nor destroyed i. e., the total energy of the system remains conserved.
SI unit of energy = joule, Commercial unit of energy = kW h
1 kW h= 1000 W x 1 h = 1000 x 3600 W = 3600000 J
Work = FxS = 7x5 = 35 J