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A Truck and a Bridge

Science brain teasers require understanding of the physical or biological world and the laws that govern it.

 

Puzzle ID:#374
Fun:*** (2.45)
Difficulty:** (1.63)
Category:Science
Submitted By:JoeyChavez**

 

 

 



A truck comes to a 1000 ft. long bridge and stops right before going on to it to read a sign. The sign says that the maximum weight the bridge can hold is 4 tons, which is the exact weight of the truck. So the truck starts going on the bridge. About halfway over the bridge a little bird lands on the top of the truck. Does the bridge break?


Answer

No, because by the time the truck is halfway across the bridge it has burned enough gas which brings its weight down to let the bird sit on it without the bridge breaking.
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