Relating Newton laws to ciil engineering

# Relating Newton laws to ciil engineering - the same amount...

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Relating Newton’s Laws to bridges For the career of civil engineering, I will be focusing on a certain type of structure: bridges Newton’s First Law : An object in motion will stay in motion unless acted upon by an outside force. An object at rest will stay at rest unless acted upon by an outside force. This law says that unless an external force is applied the bridge it will stay at rest. The wind applies forces to suspension bridges and they move. Newton’s Second Law: Fnet = ma This law says that if a force is applied to the bridge it will accelerate in the direction of that force. If the forces all add up to zero the bridge is in equilibrium and does not move. Newton’s Third Law : For every action there is an equal and opposite reaction. If a car is on a bridge it is exerting a force on the bridge, therefore the bridge must be exerting
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Unformatted text preview: the same amount of force on the car. If the bridge is not moving it is in equilibrium and all the forces will add up to zero. Hooke’s Law Hooke’s law states that Fs = kx (where Fs is the force of the spring, k is spring constant and x is the amount the spring is stretched or compressed). Materials follow Hooke’s law to a certain extent. As materials follow this law they go back to the original shape when the force is done being applied. A graph of F vs. x would be a direct relationship. Each material will reach a certain yield position where it will no longer go back to the original shape. Shortly after this the material will break....
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