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The Daily Telegraph News in Action 4
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News in Action 4 (1999)(Daily Telegraph)[Mac-PC].iso
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01069_Text_GCSE Activity Window Template.txt
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1999-02-05
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920b
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21 lines
A Brazilian's banana goal . . .
1. If a footballer scores a goal from 30m and the ball travels at an average speed
of 15m/s; how long does the ball take to reach the goal from the moment it
is kicked?
2. In some ways a spinning ball acts like an aerofoil, in that the speed of air on one side of the ball is faster than on the other.
a) What effect on air pressure does increasing the speed of the airflow have?
b) What will happen to the air pressure on the side of the ball with the
slower airflow?
c) How and in which direction relative to the spin does the ball curve?
d) Why do most footballers find it easier to use the outside of their foot to
curve a ball?
3. If a golf ball is given 2.5kW of power in half a thousandth of a second; how much energy does it receive?
4. Why might a ball not spin very well:
a) If it is hit too near the centre of gravity?
b) When it is wet?