explain the speed time graph of an object dropped from the certain height and bounces back?
Answers
Between A and B
The object accelerates at first because of the force of gravity. Its speed increases. The resultant force acts downwards because frictional force acting against it is less than the weight of the object.
Between B and C
The object is still accelerating but its acceleration decreases as time goes by. Its speed still increases but by a smaller amount as time goes by. The resultant force still acts downwards but is decreasing. This is because frictional force acting against it is increasing as the speed increases, but is still less than the weight of the object.
Between C and D
The object is not accelerating any more. It has reached its terminal velocity and is falling at a steady speed. The resultant force is zero because the frictional force acting against it is now the same as the weight of the object.
Take care: the object does not stop falling once its resultant force is zero (unless it has hit the ground!).
hope it helps.
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