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Let's say you're driving down the road at 70mph (112 kph). If you hold a sign out of your window that's 20x20 cm square, how much force will be applied to the sign by the relative wind?

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    $\begingroup$ Use the drag equation. $\endgroup$
    – lemon
    Apr 9, 2015 at 11:20
  • $\begingroup$ @lemon, Hi, thanks for that. I calculated the force to be about 20 newtons, is that about right? I'm not sure because I don't know what the units are in that formula. $\endgroup$ Apr 9, 2015 at 12:32
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    $\begingroup$ I get 25.2 Newtons. $\endgroup$
    – lemon
    Apr 9, 2015 at 17:35

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