<P> In physics , angular momentum ( rarely , moment of momentum or rotational momentum ) is the rotational equivalent of linear momentum . It is an important quantity in physics because it is a conserved quantity -- the total angular momentum of a system remains constant unless acted on by an external torque . </P>
<P> In physics , angular momentum ( rarely , moment of momentum or rotational momentum ) is the rotational equivalent of linear momentum . It is an important quantity in physics because it is a conserved quantity -- the total angular momentum of a system remains constant unless acted on by an external torque . </P>
when is the angular momentum of a system conserved
when is the angular momentum of a system conserved
the total angular momentum of a system remains constant unless acted on by an external torque
the total angular momentum of a system remains constant unless acted on by an external torque