# Physics

Sorry to double pos, I just really need help whit this.

You push an air-hockey puck along a surface with negligible friction while riding in a truck as it moves at a constant velocity in Earth's frame of reference. What do you observe? Why?

I'm tempted to say that the puck moves forward because that's all I can think of, but I really don't think that's right; there should be more to it...:(

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1. If the truck goes straight ahead at constant velocity its speed has no effect on the problem. You can not tell that the truck is moving unless it accelerates. (Gallilean Transformation)

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posted by Damon
2. Ever been in a train when it starts up quietly at the station and you look out the window and think that it is the train beside you that is moving ? :)

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posted by Damon
3. The effect of the moving truck has no impact on the traveling puck, you observe, unless you turn around a curve, then the puck appears to move in a curve on the table, but whoaho, if you plot it on Earth's frame of reference, it appears to be going in a straight line. Newton said Duh when he observed this.

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4. Okay, thank you both for your explanations. :)

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posted by Katja

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