. We say that a tree is stationary. But is the tree in motion with respect to some
other object?
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2
Answer:
Yes it is possible. We say the tree is at rest because it is at rest with respect to it's surroundings. But if we observe the tree with respect to the sun , then it is in motion as it is on the surface of the earth and the earth is continously moving around the sun.
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Answer:
Sure. If you drive past a tree, the tree is in motion with respect to your car.
Relativity says that all constant-velocity reference frames are equally valid.
However, your car doesn't have constant velocity for very long. The tree's reference frame is useful because it contains many objects - trees, road, buildings - that never accelerate.
(Actually, they ARE accelerating as the Earth rotates, so from a more universal perspective the tree's current reference frame is no more useful than the car's. But for those of us also on Earth, the rotation cancels out)
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