In a safety test, the motor of a powered sliding door exerts a constant force on the door while the door slides along its track in the direction of the force. The test is then repeated with a change to the force, the distance moved, or both.
Which change doubles the work done by the motor's force?
The force stays the same and the distance moved is halved.
The force is doubled and the distance moved is doubled.
The force is halved and the distance moved is doubled.
The force is doubled and the distance moved stays the same.
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.