Part of Lesson Plan: **Broken Bolt Extraction Methods Part 1 (updated) by Robert Thayer

Activity Overview / Details

10 minutes

Background:

Each day, when students enter the classroom, I usually have a warm up question projected on a video screen, but you could write it on the board. At the beginning of the week students grab a new blank warm up work sheet, which I have created for them, which students keep in a folder in their back packs. Students complete all the warm ups for the week on that sheet and turn in their sheet to me at the end of the week for grade points.

Also, under the daily warm up question, I have an outline of our activities for that day.

Activity:

As students enter I wait for them to take their seats, I ask them to take out their warm up work sheets, then I call their attention to a shop dilemma that I would like them to address.

Using a video camera which projects on the classroom projection screen, I will bring their attention to an 8mm intake or exhaust manifold bolt on the side of a cylinder head that I have on a bench in the classroom. I am trying to loosen the bolt, but in reality I will be tightening it. The bolt will eventually break. (You could also produce your own video of the same thing and show that to them. You could also demonstrate bolt breaking without any media, by simply acting it out in front of the class, and showing them the head of the bolt after you break it off.)

After breaking the bolt, I ask students to:

• consider what mistake was made that caused the bolt to break
• compose an answer to the question on their warm up work sheet
• they may discuss the question with their neighbors

After about five minutes, I call on students to share their answers with the class. As students, give their answers, I repeat their answers out loud. I will also call on non volunteers. After a few minutes, I take about five minutes to comment on the scenario, explaining what caused the bolt to break.