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...Option b engineering physics rigid bodies and rotational dynamics essential idea the basic laws of mechanics have an extension when equivalent principles are applied to rotation actual objects dimensions they require expansion point particle model consider possibility different points on object having states motion or velocities torque n for linear a resultant force is needed change see forces p changing involves which not directed towards axis we say that required concept similar moment key with students may be familiar in this section will only discuss do their shapes figure shows example three equal might used spanner f has no turning effect because its line action through greatest possible furthest from r provided by single can determined ff rr ssiinn couple name given sin pair parallel magnitude lines act opposite directions tending cause calculating couples general makes angle joining application length fr unit nm common mistake should confused work fs cos chapter also but more c...