A person holds a bag stationary, then carries it horizontally at a constant height. The supporting force on the bag is vertically upwards throughout. Which gives the work done by this supporting force during the two stages?
Zero while stationary; positive while carried
Positive while stationary; zero while carried
Positive while stationary; positive while carried
Zero while stationary; zero while carried
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.