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The thickness of the beam if related to the strength of the bridge because the thicker the support beams are, the stronger the bridge is.
-Jade

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The thickness of the beam is related to its strength because the beam has more support through out it, for example if the beam had the same thickness of a sheet of paper the beam would break under the weight of a car because the beam inst strong enough to hold it. The thicker the beam is the more support it has through out.
- Samara

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The thickness and the strength go along together because if the beam is strong, that means it will have a better chance of holding up the bridge. If the beam is weak, then the bridge may collapse. That is why the thickness and strength are related when it comes to a bridge.
~Breanna

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The thickness of the beam is related to the strength because the thicker it is the harder it is to break because if you have something heavier on top of the beam and it is not thick enough, it has a big chance of snapping because it can't hold that amount. If its a thicker the weight of the object will distribute itself on the thick beam and would be harder to break.
-Claire Pormento

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I think that bridge designer know what materials they need to use and which design will give it most strength because they have put a lot of things into consideration. They need to know how long the bridge will be, the thickness it needs to be, how many support beams it needs. After you know all those things you need to  find out what material you need to build it and how you will need to build it.
-Jade

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i think they know which materials will work best because the went into collage and got a degree in that field and know what they are talking about

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The thickness of a beam is related to it's strength because if there is more material, it's harder to snap and break, and no, I don't think the relationship is linear because if one inch thick could support lets say 5000 pounds, two inches thick would be hard to snap, but it wouldn't double it's strength, and eventually adding more material will make the bridge heavier, and make it easier to snap.
By- Jacob Fillion

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Bridge designers should know what materials to use for a bridge. They have to figure out what stuff stays together for the bridge and what stuff breaks.
-Marcus

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Bridge Designers know which materials to use to give the bridge strength it needs by research and learning the types of materials and see if it can withstand hard weather  or heavy materials like cars to make sure that it doesn't collapse.
-Claire Pormento

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I suppose that bridge designers know what materials and how the bridge is best built by school, experience, and trail and error. I think this because bridge builders need schooling to become bridge builders, They know what materials to use because they can test the materials strength and if they know the strength they can do test on smaller models and just scale it up once completed.
- Samara

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The thickness is related to the strength of the beam in a way where the thicker the beam is, the more weight it will be capable of supporting because it will have more volume of the material to bear the weight of the bridge making it stronger and capable of supporting more weight. I think that the relationship between the two are linear indeed because if the beam were to be very thin, it would not be able to bear the same weight as a thicker beam because there is less of an area to spread the weight through itself.
-Ashton

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Bridge designers know what materials and designs to use because one it has been done before but more importantly they have studied the strength and weakness of building materials so they can tell which one is more available to use when they need to. Design wise they know what can keep a bridge up the angles to support it beams if necessary or wires to help support. What they do is look at where they have to build and think if there was a bridge here how can we make it stable enough to hold it there.
~~~smol

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Bridge designers know what material to use because they know what each material can withstand without breaking or snapping, and they also over estimate (which is good in this case) how much the bridge will be put through.
By- Jacob Fillion

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The thickness of a beam is related to the strength because the thicker it is it helps distribute the weight across all section of it while when it is thin it doesn't have that much to work with so it can easily fall under pressure. the relationship is linear because it is almost a fixed amount of weight it can handle dependent of the thickness of the beam.
~~~smol

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I suppose that bridge designers have to do research when they are designing a bridge to know what kind of metal or material to use for the specific location and environment the bridge is being built in so the bride can last a long time and how to build the supports and how long it will be and what intervals to put the supports and what kind of bridge it will be. All of those variables is what the the bridge designers have to go through and make sure what they do will be strong and sturdy.
-Ashton

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How do you think the thickness of a bean is related to its strength? Do you think the relationship is linear?

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How do you suppose bridge designers know which materials and designs will give a bridge the strength it needs?