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Question:
Can anyone explain why an object which is at rest can have acceleration?



Replies:
Acceleration is nothing but the rate of change of velocity. Now consider a car that is at rest but is about to start moving. You press the accelerator and the car starts moving. As the velocity of car has changed from zero to a nonzero value, the car must have had acceleration even though it was at rest. I hope this will suffice.

jasjeet


You might also want to consider what you mean by "at rest". Something that is a rest and stays at rest is not accelerating -- in the frame of reference in which the "at rest" measurement was made. However, if we step into a different reference frame (for example, a space ship watching the earth) we would find that a book on a table (on earth) which appears stationary to someone on earth is actually travelling in a very complicated path (earth rotating & revolving, galaxy moving, etc.) and was indeed accelerating when measured from that frame.

gregory r bradburn



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