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Assertion: Torque is an axial vector. Reason: Force is a polar vector.
A: Torque on a body can be zero even if there is a net force on it. R: Torque and force on a body are always perpendicular.
A: A couple does not exert a net force even though it exerts a torque. R: Couple is a pair of two forces with equal magnitude but opposite directions acting simultaneously on a body in different lines of action.
A: To unscrew a rusted nut, we need a pipe wrench of longer arm. R: Wrench with longer arm reduces the force applied on arm.
(i) Why do we prefer to use a wrench, having a long arm? (ii) Under what condition, the torque due applied can be considered to be zero?
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