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# Bridge lesson 5 8

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• At each students desk is a copy of this hand out with the question: Indicate the forces acting on this bridge
• What is the direction of the force at the center of this painting?
• Force is a vector quantity, it has both magnitude and direction. Movement is an applied force
• The NASA Shuttle has imaged a mysterious ancient bridge between India and Sri Lanka that’s about 1,750,000 years old
• Compression and tension forces can be dissipated into the earth
• ### Bridge lesson 5 8

1. 1. Bridges
2. 2. What are the forces acting on this simple beam bridge?
3. 3. What are forces? PULL PUSH Force has both magnitude and Force direction
4. 4. F(g) Pulls Wiley down F(g)= ma Force is measured in N (Newtons) What is gravity? M= Mass A= Acceleration ofhttps://www.youtube.com/watch?v=JlLSc3tZAyc. gravity or 9.8 m/s2
5. 5. 7/8 grade https://www.you F(g) pulls down tube.com/watch ?v=aJc4DEkSq4 I&feature=fvwr el F(n) pushes upForces need to be in balance for something like YOU or a static Bridge to stand at rest
6. 6. Bridges For many hundreds of years humans have used bridges to traverse difficult geographical terrain Our species wasn’t the first to do this….
7. 7. Ant societies have division of labor, communication between individuals,and an ability to solve complex problems. http://www.youtube.com/watch?v=IBTjQMtbViU&feature=related
8. 8. Ants have hooked claws at the end of their legs. They use this to hook themselves togetherto make sturdy highways that can carry many, many times their own weight.. Tension forces PULLING OUT Compression Forces PUSHING IN The even distribution of forces is what keeps our modern day bridges together as well Video of an ant raft barely clinging together http://www.youtube.com/watch?v=L2ZysgGAABw&feature=related