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06-17-2010, 05:09 PM
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Originally Posted by AIREAYE View Post
F= ma is only applicable in a theoretical closed system, but you've gotta factor air resistance in this one. Yes your hypothesis on mass being inversely proportional to acceleration is correct but he's asking for puck VELOCITY/Speed and not acceleration, a lighter puck would probably accelerate off a shot faster, but its terminal velocity (maximum speed) would be less that of a heavier puck (depending how much heavier), whose greater momentum (momentum = mass x velocity) would 'push it thru' air resistance easier. But again, this is all theoretical of course
yeah, high school physics is generally about closed systems.

But either way it's a relevant distinction to say that the lighter puck might travel slower because it's more susceptible to air resistance as opposed to just not initially moving as fast (less to do with the amount of force put into the shot).

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