A ceiling-mounted trolley moves a lighting unit using a vertical cable. The cable exerts a constant upward force of 45 N on the lighting unit. The unit is raised vertically by 1.2 m, moved horizontally, and then raised vertically by a further 0.8 m.
The trolley could move the lighting unit a greater distance horizontally between the two vertical movements. Explain why this would not change the total work done by the force from the cable.
Calculate the total work done by the force from the cable during the journey.
115 exam-style questions on Edexcel GCSE Physics 8.1 Energy transfers and work, covering 8.1.1 Energy stores and transfer diagrams, 8.1.2 Ways of changing a system's energy, and 8.1.3 Work done by forces. Each one has a worked solution and a mark scheme showing where the marks go.