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Haliday-Resnick-Walker state that the escape velocity will cause a projectile to move upward forever, theoretically coming to rest only at infinity. I was wondering what the forces forcing the body to come to rest at infinity are when the authors are using the word"theoretically".Your help is appreciated. |
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It's gravity. Gravity is the force that attracts the projectile to the thing it's escaping from, so gravity is the force that brings it closer and closer to rest as it gets further away. You could also talk about the escape velocity of a charged particle from another (oppositely) charged particle, and in that case the electromagnetic force would be the dominant contribution. But for whatever reason, people don't usually talk about escape velocity in reference to electromagnetism. |
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