CONTENT MODULE 4SUBTOPIC 4 – Create a Video Recording of Bridge Test

For this activity, you will set up and operate a flip camera on a tripod to record the testing process of your finished bridge. It will be paramount that you insure the camera remains stable during the testing process and that the camera is positioned in front of the bridge so that the entire testing process, including eventual bridge failure is captured. After bridge testing, you will review your video footage and determine which of the primary force or forces acted on your bridge during its failure.

Objectives

1. STUDENTS WILL… Utilize classroom flip camera effectively;a) Being respectful of the hardware itself.b) Only recording content/activities the teacher has told you to record.

2. STUDENTS WILL… Use a flip camera to create a stable video of the testing process of their bridge.

3. STUDENTS WILL… Use classroom lap top to review the video footage.4. STUDENTS WILL… Analyze the video footage to determine and identify which

primary force(s) acted on your bridge during its failure.a) Tensile Stress – Pulling forcesb) Shear Stress – Tearing forcesc) Compression Stress – Squeezing forcesd) Torsion Stress – Twisting/Bending forces

CONTENT MODULE 4Instructions

1. Obtain a Sony tripod and Bloggie camera from your instructor.

2. Note where the threaded female end is on the Bloggie cam.

CONTENT MODULE 43. CAREFULLY thread the Bloggie camera onto the tripod, being careful not to cross

thread the camera as you install it on the tripod.

4. Now adjust the camera so that the tripod is set to the height of your bridge on the testing apparatus.

CONTENT MODULE 45. BE SURE you can clearly see the entire bridge and testing apparatus in the viewfinder of

the Bloggie camera.

6. When your instructor gives you the cue, press the record button and begin recording the bridge test. Keep the camera and tripod stable throughout the test of the bridge.

7. When your test is complete, stop recording, and be sure to save the video.

CONTENT MODULE 4

8. Collapse your tripod and unscrew your Bloggie camera.

9. On the bottom of the Bloggie camera, next to the female threaded end is the flip-out USB connector. Press gently and open the USB connector.

10. Carefully insert the Bloggie camera into the USB drive on your laptop. In Windows Explorer;

a) Open BLOGGIE folderb) Open DCIM folderc) Open 101MSDCF folderd) Your video file is here

11. View your bridge test video. Based on what we learned about the four primary forces, analyze the force(s) that caused your bridge to fail. Describe why you think it was the force or forces.

a) Tensile b) Shearc) Compressiond) Torsion

CONTENT MODULE 412. Next, complete the efficiency calculation for your bridge to determine how strong your

design was;

TOTAL WEIGHT OF BRIDGE IN GRAMS: __________

TOTAL WEIGHT HELD BY BRIDGE IN LBS.: _________

CONVERT LBS. TO GRAMS!!!

WEIGHT HELD BY BRIDGE IN LBS ________ x 453.592 (grams in 1 lb)

______________________ grams held by bridge

EFFICIENCY!!!

WEIGHT HELD BY BRIDGE IN GRAMS: ____________

WEIGHT OF BRIDGE IN GRAMS: ______________

= _____________ grams held per each gram of bridge weight

Activity – BRIDGE VIDEO