CBSE 11th Standard Physics Subject System of Particles and Rotational Motion Ncert Exemplar 5 Mark Questions 2021
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CBSE 11th Standard Physics Subject System of Particles and Rotational Motion Ncert Exemplar 5 Mark Questions 2021
11th Standard CBSE
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Reg.No. :
Physics
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A door is hinged at one end and is free to rotate about a vertical axis. Does its weight cause any torque about its axis? Give reason for your answer .
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CBSE 11th Standard Physics Subject System of Particles and Rotational Motion Ncert Exemplar 5 Mark Questions 2021 Answer Keys
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As torque = r \(\times \) F
That means torque produced by force is in a plane perpendicular plane containing rand F.
So, if door is in xy-plane, torque produced by weight is in ± z-direction,
It is never about an axis passing through y-direction.
