An air-hockey puck remains at rest while two horizontal air jets push in opposite directions, one east and one west. The eastward jet briefly provides a larger force. It then returns to its original force, while the westward jet is unchanged. No other horizontal forces act. How does the puck move after the eastward force returns to its original value?
It remains at rest at its starting position.
It moves east and then slows to rest.
It moves west at a constant speed.
It moves east at a constant speed.
103 exam-style questions on Edexcel GCSE Physics 2.3 Forces and Newton's laws, covering 2.3.1 Newton's first law, 2.3.2 Newton's second law, and 2.3.3 Weight and gravitational field strength. Each one has a worked solution and a mark scheme showing where the marks go.