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jawrigh1
Joined: 07 May 2006
Posts: 18
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 Posted: Thu Sep 17, 2009 10:52 am Post subject: Physics Review Question from Lesson |
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What force is required to lift a 16-lb block vertically with an acceleration of 16 ft/s2?
In the solution the answer is calculated by using:
F=ma+mg , why was mg also added? I understand everything else slugs conversion, etc. However, I can't figure out why it's not just F=ma,which would make the answer 8. Please help? |
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mcat_premed3832
Joined: 19 Oct 2006
Posts: 413
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| Posted: Fri Oct 02, 2009 1:29 pm Post subject: |
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| ma gave you the force of movement; but you must add the weight! Otherwise, imagine that to accelerate a mass requires less force than just holding it and NOT moving it? Impossible. |
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