Complete the following sentences: (i) The S.I. unit of moment of force is …………… (ii) In equilibrium algebraic sum of moments of all forces about the point of rotation is ……………. (iii) In beam balance when the beam is balanced in a horizontal position, it is in …………… equilibrium. (iv) The moon revolving around the earth is in ……………equilibrium.

(i) The S.I. unit of moment of force is Newton metre (Nm).(ii) In equilibrium algebraic sum of moments of all forces about the point of rotation is zero.(iii) In beam balance when the beam is balanced in a horizontal position, it is in static equilibrium.(iv) The moon revolving around the earth is in dynamic equilibrium.