State the energy changes that occur in a watch spring while it unwinds.
Energy can exist in several forms and may change from one form to another.For each of the following,state the energy changes that occur in:
(a) the unwinding of a watch spring,
(b) a loaded truck when started and set in motion,
(c) a car going uphill,
(d) photosynthesis in green leaves,
(e) charging of a battery,
(f) respiration,
(g) burning of a match stick.
(h) explosion of crackers.
State the changes in form of energy while producing hydroelectricity