How can a helicopter hover?
1-When people are lifted from a boat; the helicopter has to keep very still. This is difficult because the weight of the helicopter is always pulling it downwards.
(a) What force is acting upwards on the helicopter?
(b) Explain how the helicopter can keep still.
2-What would happen to the helicopter if
(a) The uplift was greater than the weight?
(b) The weight was greater than the uplift?
Give reasons for your answers.
3-Find the resultant force (the forces all act along the same line)
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