Form 2 Track 2 Physics Worksheet - Annual Examinations For Secondary Schools, 2012 Page 10
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118.
A falling metal hammer is used to insert a hollow steel post into the ground as shown in the
diagram. The hammer is lifted by an electric motor and then allowed to fall freely to hit the
base plate.
rope from motor
to lift hammer
metal hammer
hollow steel post
ground
base plate
i.
The Principle of Conservation of Energy states that energy is neither
_______________ nor _______________ but only _______________ from one
form to another.
(3)
ii.
Complete the energy conversions that take place as the hammer falls.
P.E. of hammer
(3)
iii.
The metal hammer has a mass of 1500 kg. It hits the base plate with a speed of
8 m/s. Calculate the kinetic energy of the hammer as it hits the base plate.
________________________________________________________________________________
________________________________________________________________________________
(3)
iv.
What is the initial potential energy of the hammer if all the energy is conserved?
________________________________________________________________________________
(1)
Page 10 of 11
Physics – Form 3 Secondary – Track 2 – 2012
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