Physics Sec Sample Paper I Worksheet - University Of Malta, 2012 Page 7

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6.(a)
Isaac Newton is one of the most famous scientists. The legend has it
that Newton saw an apple fall in his garden, thought of it in terms of an
attractive gravitational force towards the earth, and realized that the
same force might extend as far as the moon.
(i)
Karl wanted to test Newton’s idea. He took two apples, one much
bigger than the other and released them at the same time from the same
height. Explain why both apples take the same amount of time to
reach the ground.
_____________________________________________________________________
(1)
(ii)
Karl throws one apple upwards. What is the value of the acceleration
of the apple at maximum height?
_____________________________________________________________________
(1)
(b)
A toy truck of mass 0.5 kg travelling at 0.25 m/s collides with another toy
truck of mass 0.45 kg initially at rest. After collision, the two trucks stick and
move off together.
(i)
Calculate their common velocity after collision. Name the principle
used in your calculation.
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
Principle used ___________________________________________________
(3)
(ii)
Calculate the total kinetic energy of both trucks before collision.
____________________________________________________________________
____________________________________________________________________
(2)
(iii)
Calculate the total kinetic energy of both trucks after collision.
____________________________________________________________________
____________________________________________________________________
(2)
(iv)
Explain why the value for b(ii) and (iii) above are different.
____________________________________________________________________
(1)
Page 7 of 11

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