Thread: Bridge Mass Properties
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Unread 23-06-2002, 23:02
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#0047 (ChiefDelphi)
  
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Re: Bridge Numbers PS
Posted by Dodd Stacy at 1/16/2001 11:32 AM EST


Engineer on team #95, Lebanon Robotics Team, from Lebanon High School and CRREL/CREARE.


In Reply to: Re: Bridge Numbers PS
Posted by Eric Reed on 1/16/2001 10:55 AM EST:



: Hi Dodd,

: For a non-physics person...what does this mean? I think your message answers the following two questions, but can you make it easy for me:

: How much weight placed at the lip of the bridge would begin to move the bridge from tilted position?

Very little, a pound or two.

: How much weight placed at the lip of the bridge would begin to move the bridge from balanced position?

About 10 pounds.

: Also, I assume that loading the bridge with, say, a 100 lb robot and two 70 lb goals would raise the weights required to move the bridge. Is that intuition correct?

Exactly. The forces should scale with the total weight. I think 240 lbs of robot and goal on the 214 lb bridge will take (454/214)x10 lbs or about 20 lbf, give or take, to begin movement from the balanced position, with the robot exactly centered (lengthwise). This is going to be awfully tender to the robot's position along the length of the bridge, though. Less than 6" off center, and the balanced bridge will begin tipping. Stop it if you can! Dodd

: Thanks,

: Eric.


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