# How much wind does it take to tip a sign over? [closed]

Or said another way - how much counterweight does the base of a sign need to keep it from tipping over given a specific max wind?

• Assume the sign does not let wind through
• Assume the base of the sign cannot slide on the ground
• Assume the sign does not flex in the wind
• Assume total weight of the sign + base is 125 lbs (base is 96 lbs)

Are there any other parameters needed?

The sign has the design and measurements below:

Edit: This would probably be helpful: Width of sign is 8' so the sign is 9' high x 8' wide.

## closed as off-topic by Brandon Enright, Kyle Kanos, John Rennie, DavePhD, PraharJun 22 '14 at 11:08

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• By how much wind, do you mean the wind speed required to tip the sign? Also, this problem is not solvable without knowing the drag force the wind exerts on the sign – Pranav Hosangadi Jun 21 '14 at 11:02
• Thanks, Pranav. By drag force, is this the same as saying how much wind goes through the sign? Sorry - I'm not up on all the physics terms. Physics class was many decades ago, and I'm just an adult trying to design a marching band prop! :-) In this case, one can assume the sign is completely flat and does not let any wind through it (it's a tarp material). – joelq Jun 22 '14 at 1:13
• Oh, and yes, by how much wind, I'm looking for how much wind the sign can take before tipping over. – joelq Jun 22 '14 at 1:14