Physics Annual Examinations For Secondary Schools Form 5 - Directorate For Quality And Standards In Education, 2013 Page 12

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b.
A block of lead of mass 5 kg is dropped from a height of 8 m. Calculate the:
i.
initial potential energy of the lead block.
___________________________________________________________________________
(2)
ii.
kinetic energy of the lead block just before it touches the ground assuming no air
resistance. Give one reason for your answer.
___________________________________________________________________________
(2)
iii.
Complete the following flow-chart showing the energy changes when the lead block
falls through a height of 8 m and hits the ground, assuming no air resistance.
_____________ energy
potential energy
_____________ energy
___________ energy
(3)
c.
When the lead block of mass 5 kg hits the ground, 300 J of energy are generated in the lead
block. Calculate the change in temperature of the lead block given that the specific heat
o
capacity of lead is 130 J/kg
C.
___________________________________________________________________________
___________________________________________________________________________
___________________________________________________________________________
(3)
Physics – Secondary Schools – Track 3 - Form 5 – 2013
Page 12 of 12

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