07 (a) What do you understand by the principle of conservation of energy?
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Transcribed Image Text:67 (e) What do you understand by tdhe principle of
conServation of energy?
(b) Expiain how the principle applies to:
(1) an object falling from rest in vacuo,
(ii) a man sliding from rest down a.
vertical pole, if there is a constant
resistive force opposing the motion.
Sketch graphs, using one set of axes for
(i) and another set for (i), showing how
each form of energy you consider varies
with time, and point out the important
features of the graphs.
(c) A motor car of mass 600 kg moves with
constant speed up an inclined straight
road which rises 1.0m for every 40m
travelled along the road. When the brakes
are applied with the power cut off, there is
a constant resistive force and the car
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