What you’ll learn4 learning objectivesChoose one objective for a focused lesson, or study the complete topic.4.1.1The weight of an object may be taken as acting at a single point known as• understand that the weight of an object may be taken as acting at a single point known as its centre of gravitySyllabus objective4.1.2The moment of a force• define and apply the moment of a forceSyllabus objective4.1.3A couple is a pair of forces that acts to produce rotation only• understand that a couple is a pair of forces that acts to produce rotation onlySyllabus objective4.1.4The torque of a couple• define and apply the torque of a coupleSyllabus objective