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A non uniform beam of weight 120 N pivoted at one end is shown in the diagram below. Calculate the value of F to keep the beam in equilibrium.
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.
(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?
(a) What are the differences between the centre of gravity and the centre of mass? (b) A square plate of mass 120 g and edge 5.0 cm rotates about one of edges. If it has a uniform angular acceleration of 0.2rad/s², what torque acts on the plate?
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