Mr. Slavinsky Walter Reed Middle School 8th Grade Physical Science Building a Bridge Mr. Slavinsky Walter Reed Middle School 8th Grade Physical Science

Warm-Up Describe 1 type of bridge that you have seen. Sketch a picture.

Objective: Students will learn about the 4 types of bridges and their strengths and weaknesses. Students will create a bridge that will be able to sustain the greatest weight.

Beam Bridge

Cable-Stayed

Arch Bridge

Suspension Bridge

Human Bridge Pairs of students face each other with palms touching about 1 ½ feet apart. Move feet back while keeping palms touching until you cannot back up any more/balanced bridge. Where on the bridge do you feel compression/tension? Have one person move 2 steps to the left. What happens to the balance of the bridge?

Groups Groups of 3 No group changes without teacher consent

@ Home Go to: http://www.pbs.org/wgbh/nova/bridge/ Complete “Which Bridge” worksheet. Due Tomorrow Play “Build a Bridge Game” Record answers on worksheet.

Build a Bridge Students will have access to: Time Requirements: Popsicle Sticks White Glue Time Requirements: 1 Day to sketch blueprint 2 Days to complete bridge

Build a Bridge All bridges MUST be: Made entirely of popsicle sticks and white glue. Able to span a 40 cm gap. Have a mass less than 100g Have a whole in the middle that is at least 4 cm in diameter so that the testing bar can be inserted.

Bridge Testing Bridge Testing Worksheet

Grading Which Bridge Worksheet – 20 points Blueprint – 30 points Bridge Testing Worksheet – 20 points Participation – 30 points Bridge – 100 points 1-2 place: 100 points 3-4 place: 85 points 5-6 place: 75 points 7-8 place: 65 points >9 place: 50 points No Bridge = 0 points