bio- -mimicry

A mass or weight supported by something

A force that squeezes a material together A force that stretches a material apart An action that twists a material Compression- Tension- Torsion-

Due to budget cuts, the City of Lafayette is cutting the number of crossing guards used in the area. They have decided to put pedestrian bridges over high traffic areas for Sunnyside and Lafayette Christian students walking to and from school, such as 26th Street and South Street as well as 26th Street and Union Street. They have decided to ask for your input on the design of a pedestrian walking bridge and are deciding which type of bridge, either a beam bridge or truss bridge, would be best to implement. They have asked for you to design prototypes to determine which bridge type will be the strongest and use the least amount of materials. This bridge needs to be safe for walking — it should be stable and durable for several kids to walk across at the same time. It needs to span across the two lanes of 26th Street and be tall enough for cars and trucks to pass underneath..

Use only supplied materials (20 straws, 1 meter of tape, & 10 note cards) Bridge spans 25 cm in length. Bridge is built on abutments, with a bottom at least 15 cm off the ground. Bridge can be fastened to the books being used as abutments, but no materials can be secured to the floor or table. Bridge must be completed within the provided time limit Bridge must be able to support the mass of at least 25 pennies. Bridge must fit the style of bridge assigned to the team