Chapter 10&ll 质点的转动 11-3 Angular Momentum of a particle(P277-278) 1. Torque on an axis(对轴的力矩) The torque about a given axis is defined as z=R1F=RF⊥ or t=REsin where r, is called moment arm- the distance from the axis of rotation Point of Axis of application that is perpendicular to the rotation of force R line of action of the force Its si units: m N RChapter 10&11 质点的转动 1. Torque on an axis (对轴的力矩) : 11-3 Angular Momentum of a particle (P277-278)  = RF sin where is called r⊥ moment arm —— the distance  = R⊥ F Its SI units: m N The torque about a given axis is defined as: or from the axis of rotation that is perpendicular to the line of action of the force. = RF⊥