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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

Verified by Experts

The correct Answer is:
C
`vecF_("gravitational")` acts downwards.
`vecF_("drag")` acts opposite to the direction of the motion.
Now let us see how `vecF_("rotor")` acts.

Wings of the helicoper will push the air perpendicular to their plane to rotation as shown in figure. From the third law, air will apply force `vecF_("rotor")` on the wings as shown in the Fig.
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 the helicopter is constant.
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