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2000 N

A car is driven from rest. Since it is at rest, the air resistance = 0 N Engine force = 2000 N The car accelerates. 2000 N. Air resistance increases as speed increases. The car still accelerates. Resultant Force = 1700 N. 300 N. 2000 N.

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2000 N

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  1. A car is driven from rest.Since it is at rest, the air resistance = 0 NEngine force = 2000 NThe car accelerates. 2000 N

  2. Air resistance increases as speed increases.The car still accelerates.Resultant Force = 1700 N 300 N 2000 N

  3. Air resistance continues to increase until it becomes EQUAL to the engine force.The car does not accelerate any longer and moves at constant speed. The resultant force = O N 2000 N 2000 N

  4. Suddenly a cat crosses the road!The driver applies the brakes and the frictional forces are greater than the engine force.The car decelerates.The resultant force = - 6000 N 8000 N 2000 N

  5. Finally the car stops. The cat is safe!

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