Comprehensive lesson containing a full presentation and worksheet. Model answers for the worksheet are included This resource covers mass, weight and force basics for the OCR A Level Physics A course. However, it is also useful for other exam boards. This lesson teaches the following content: -the newton as the unit of force -weight of an object; W = mg -the terms tension, normal contact force, upthrust and friction -free-body diagrams -centre of mass; centre of gravity; experimental determination of centre of gravity Click on the links below to check out some of our other FREE A Level Physics resources: Net Forces & Equilibrium Lesson Moments & Torques Lesson Drag & Terminal Velocity Lesson Density, Pressure & Upthrust Lesson