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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A car is driven from rest.Since it is at rest, the air resistance = 0 NEngine force = 2000 NThe car accelerates.
Air resistance increases as speed increases.The car still accelerates.Resultant Force = 1700 N
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
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
Finally the car stops. The cat is safe!