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2. A train is passing through a station at constant speed, as shown in Figure below. The track is horizontal. Fig 2.1 The engine produces a forward thrust of 70 000 N. There is a 25 000 N force opposing the motion, due to friction in the wheels. (a) Mark these forces using an arrow labelled 70 000 N and an arrow labelled 25 000 N [1] (b) The train is travelling at constant speed, so there must be another horizontal force acting on it. (1) State the direction of this force. _ ([1] (1) Calculate the magnitude of this force. magnitude of force = (c) Once the train has passed the station, the driver increases the engine's forward thrust. All other forces stay the same. () What happens to the train? () Why does this happen N [1] [1] (1)
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