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08-24-2019, 09:49 PM | #63923 (permalink) |
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You toss a ball up in the air. At the top of its motion, it's momentarily at rest (velocity zero). However, it's still accelerating downward at 9.8 m/s² (due to gravity).
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08-24-2019, 09:50 PM | #63924 (permalink) | |
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is that like an object floating underwater that has water acting against it but has buoyancy acting to make it rise so that it's stationary but there's still a force trying to make it accelerate?
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08-24-2019, 09:59 PM | #63925 (permalink) | |
Remember the underscore
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If the ball were sitting at rest on the earth, however, then its acceleration would be zero. Even though gravity pulls down on it, there's a corresponding upward force exerted by the ground that balances it out. Being "at rest" (i.e., zero velocity) with nonzero acceleration only happens instantaneously.
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08-24-2019, 10:02 PM | #63926 (permalink) | ||
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08-24-2019, 10:07 PM | #63927 (permalink) |
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PS
Are you going to tell him the newtons equal out in that case?
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08-24-2019, 10:09 PM | #63929 (permalink) |
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Air pressure adds weight.
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08-24-2019, 10:18 PM | #63930 (permalink) | |
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I mean that the air pressure is adding permanent change to velocity that if removed would stop changing velocity. Like what's the difference between a ball hanging in midair and a ball sitting on the ground with air pushing down on it when if that air were removed would change/add velocity?
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