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Force and Laws of Motion
A 8000 kg engine pulls a train of 5 wagons, each of 2000 kg, along a horizontal track. If the engine exerts a force of 40000 N and the track offers a friction force of 5000 N, then calculate:
(a) the net accelerating force and
(b) the acceleration of the train.
(a) Net accelerating force = Force exerted by the engine - friction force
Net accelerating force = 40000 N - 5000 N
Net accelerating force = 35000 N
(b) Net accelerating force on wagons = 35000 N
Total mass of the train = Mass of train + Mass of 5 wagons
Total mass of the train = 8000 kg + 5 2000 kg
Total mass of the train = 8000 kg + 10000 kg
Total mass of the train = 18000 kg
For finding acceleration(a) of the train, we use
F = ma
35000 = 18000 a
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