Diagram 7.1 and Diagram 7.2 show a student throwing a
javelin using different throwing techniques. The force applied by the student
is the same for both situations. The angles of projection are different.
(a)
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Observe Diagram 7.1 and Diagram 7.2.
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(i)
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Compare the distance travelled by the javelin from A to B.
Farther
/further in Diagram 6.2 compared to Diagram 6.1
…………………………………………………………………………..
[1 mark]
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(ii)
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What happens to distance of
the javelin if the angle of projection is less than the angle of projection
as shown in the Diagram7.2?
Decreases
……………………………………………………………….…………
………………………………………………………………………….
………………………………………………………………………….
[1 mark]
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(b)
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Suggest a suitable shape for the javelin so that it moves
with minimum resistance through the air.
Streamline
/ aerodynamic
…………………………………………………………………………….........
…………………………………………………………………………….........
[1 mark]
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(c)
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If the force acting on the javelin is 10 N and the
distance travelled by the Javelin is
70 m, Calculate the work done by the student in Diagram 7.2.
W = 10 x
70
=
700 J
[2 marks]
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(d)
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(i)
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State the changes of energy experienced by the javelin
from A to B in both techniques.
Kinetic
energy to potential energy to kinetic energy
………………………………………………………………………….
[1 mark]
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(ii)
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State the energy produced when the javelin touches the
ground.
Sound /
heat
…………………………………………………………………………..
[1 mark]
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