Per NCERT §6.8.1 (principle of moments / lever), at equilibrium a lever satisfies which condition?
ASum of clockwise τ equals sum of anticlockwise τ
BSum of all linear accelerations is zero only
CSum of all forces vanishes only (no torque)
DTotal weight equals total normal reaction force
Answer & Solution
Correct answer: A. Sum of clockwise τ equals sum of anticlockwise τ
NCERT §6.8.1: lever's law — moments about the fulcrum balance. CW torques = ACW torques.
Related questions
Per NCERT §6.11 (frictionless rigid body), the work done by an external torque equals whicPer NCERT Example 6.12, after 2 m of cord unwinds at 25 N pull, the work done by the pull Per NCERT Example 6.12, the angular acceleration of the same flywheel under a 25 N pull (τPer NCERT Example 6.12, a flywheel of M=20 kg, R=0.2 m has I = MR²/2 = which?Per NCERT §6.12 (and many examples), if an ice skater pulling arms inward DECREASES her moPer NCERT §6.8.2, the CENTRE OF GRAVITY of an extended body in a UNIFORM gravitational fiePer NCERT §6.8 (equilibrium of a rigid body), a rigid body is in MECHANICAL equilibrium whPer NCERT §6.11 eqn 6.40, the POWER delivered by a torque is which?