What you’ll learn7 learning objectivesChoose one objective for a focused lesson, or study the complete topic.5.1.1The concept of work, and recall and use work done = force × displacement in• understand the concept of work, and recall and use work done = force × displacement in the direction of the forceSyllabus objective5.1.2The principle of conservation of energy• recall and apply the principle of conservation of energySyllabus objective5.1.3That the efficiency of a system is the ratio of useful energy output• recall and understand that the efficiency of a system is the ratio of useful energy output from the system to the total energy inputSyllabus objective5.1.4The concept of efficiency to solve problems• use the concept of efficiency to solve problemsSyllabus objective5.1.5Power as work done per unit time• define power as work done per unit timeSyllabus objective5.1.6P = W / t• solve problems using P = W / tSyllabus objective5.1.7P = Fv and use it to solve problems• derive P = Fv and use it to solve problemsSyllabus objective