1. Why did Mr West say of his boomerang "Once you have bent it, it
becomes useless"?
2. a) Draw a diagram of an aerofoil to explain how the difference in speed of air flow over its opposite surfaces can generate pressure difference and lift.
b) Besides in boomerangs, where else do you find aerofoils?
3. Part of the secret of throwing a boomerang lies in choosing the correct angle of ascent so as to achieve maximum lift for the longest period of time.
a) What happens to an aircraft if it attempts to ascend at too great an angle to the horizontal?
b) Why might the boomerang start to return when it reaches a certain point in its trajectory?
