wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

A helicopter is moving to the right at a constant horizontal velocity. It experiences three forces Fgravitational,Fdrag and force on it caused by rotor i.e. Frotor. Which of the following diagrams can be correct free body diagram representing forces on the helicopter?


A

No worries! We‘ve got your back. Try BYJU‘S free classes today!
B

No worries! We‘ve got your back. Try BYJU‘S free classes today!
C

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D

No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is C


Fgravitational acts downwards.

Fdrag acts opposite to the direction of motion.

Now let us see how Frotor acts.

Wings(rotor blades) of helicopter will push the air perpendicular to their plane of rotation as shown in figure (a). From third law, air will apply force Frotor 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.
The right answer has to have Gravitational force downwards, drag force opposite to direction of motion and rotor force as the resultant of these two in the opposite direction to balance it out.


flag
Suggest Corrections
thumbs-up
4
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
The Journey So Far
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon