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A helicopter is moving to the right at a...

A helicopter is moving to the right at a constant horizontal velocity. It experiences thre forces `vecF_("gravitational"), vecF_("drag")` force on it caused by rotor `vecF_("rotor")`. Which of the following diagrams can be a correct free body diagram represents forces on the helicopter?

A

B

C

D

Text Solution

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The correct Answer is:
C


`vecF_(gravitational)` acts downwards.
`vecF_(drag)` acts opposite to the direction of motion.
Now let us see how `vecF_(rotor)` acts.
Wings of helicopter will push the air perpendicular to their plane or rotation as shown is figure (a). From third law, air will apply force `vecF_(rotor)` on the wings as shown in figure (b).
There is no force ma. Basically ma is the resultant of all the forces acting on a body. moreover, here a is zero because velocity of helicopter is constant.
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