Home › CBSE Class 11 (Science) › Physics › Rotational Motion › When is the torque of a non-zero force about a p…
When is the torque of a non-zero force about a point zero?
AIts line passes through the point
BForce is perpendicular to r
CForce is at 45 degrees to r
DForce acts far from the point
Answer & Solution
Correct answer: A. Its line passes through the point
If the line of action passes through the origin, the angle between r and F is 0 or 180 degrees and sin of that angle is zero.
Related questions
Which property is shared by both the scalar and the vector product?Moment of force and angular momentum are both defined asA wheel turns through angle Δθ in time Δt. Its average angular velocity isThe moment of inertia of a composite rigid system about an axis isMoment of inertia about an axis equals the ratio of the applied torque to the resultingTwo small masses m are fixed at the ends of a light rod of length l. I about a perpendiculThe total torque on a system does not depend on the chosen origin when the total externalA rigid body fixed at one point or along a line can have