Physics Worksheet - Annual Examinations For Secondary Schools, 2013 Page 3
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103. The diagram shows a set of shelves with a number
of jars on it.
(a)
Complete the Principle of Conservation of
Energy .
Energy is neither ___________________ nor
___________________ but only changed from one
form to another.
(2)
1.2 m
(b) (i) The distance between the floor and one of the
shelves is 1.2 m. The mass of one jar is 0.4 kg.
Calculate the potential energy gained when one jar is lifted from the floor onto this
shelf.
__________________________________________________________________________
__________________________________________________________________________
(2)
(ii)
Accidentally this jar falls off the shelf. What is the kinetic energy of the jar just above
the floor?
__________________________________________________________________________
(1)
(iii) Calculate the velocity of the jar just before it hits the floor.
__________________________________________________________________________
__________________________________________________________________________
__________________________________________________________________________
(2)
(iv) What would happen to the velocity if the same jar falls from the top shelf ?
__________________________________________________________________________
(1)
Physics – Secondary Schools – Track 3 – Form 3 – 2013
Page 3 of 10
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