When designing structures, it is important to know the physical properties of your construction materials, and the forces that will be exerted on those materials after construction is complete. a. True
b. False

a. True

Explanation:

This statement is true, and incredibly important. Every material used in construction has a breaking point and a deformation point. A breaking point is the amount of stress or weight  material can handle before it completely gives out and breaks while the deformation point is the point in which it begins to bend or change its shape. Therefore, it is incredibly important to know both this information and the amount of force that will be exerted onto the materials. Mainly because if the amount of force exceeds these points it will cause the material to deform/break which can cause the entire structure to collapse and either injure or kill many people.

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there are no contact forces mentioned on the list of choices that you've provided.