Math Focus 8
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# Totally Tubular

## INTRODUCTION

You’re working for a manufacturer of electric lamps. The lamps are shipped in pieces and then assembled by the buyer. One of the pieces is a metal tube that fits in the base of the lamp and also supports the fitting for the bulb.

You will choose the tubing for a new lamp, and make sure it can be protected while shipping.

## THE PROCESS

1. Decide how tall your lamp will be – will it be a table lamp or a floor lamp? Then decide how long the tube needs to be.

2. You’re going to buy your tubes from Metric Sized Metals . Decide on the type of metal for the tube and the diameter of tube you will use. (An electrical cord will go through the tube.) Record your decisions about the dimensions of the tube.

3. To protect the ends of the tube during shipping, you should cover the tubes with plastic caps from Caplugs. (Choose a non-threaded, straight cap, and use the outside diameter of your tube while making your choice.)

4. When one of your tubes has the caps you chose on its ends, what area of tube will be protected?

5. Your boss insists that the tube should also be put in a plastic sleeve. What is the minimum diameter of the plastic sleeve? What will be the capacity of a plastic sleeve with the minimum diameter?

6. Draw a diagram showing the dimensions of each of the parts needed for your lamp tube.

## RESOURCES

Websites:

Materials: paper, pencil, compass

## ASSESSMENT

 Criteria Work meets standard of excellence Work meets standard of proficiency Work meets acceptable standard Work does not yet meet acceptable standard Connections: Applies knowledge or skills in new contexts Demonstrates a sophisticated ability to transfer knowledge and skills to new contexts. Demonstrates a consistent ability to transfer knowledge and skills to new contexts. Demonstrates some ability to transfer knowledge and skills to new contexts. Demonstrates a limited ability to transfer knowledge and skills to new contexts. Problem Solving: Make a Plan Develops a thorough plan for solving the problem. Chooses an efficient and effective strategy. Develops a workable plan for solving the problem. Chooses an appropriate and workable strategy. Develops a basic plan for solving the problem. Chooses a simplistic and routine strategy. Develops a minimal and/or flawed plan for solving the problem. Chooses an inappropriate or unworkable strategy. Problem Solving: Carry out the Plan Shows flexibility and insight when solving the problem, adapting if necessary. Shows thoughtfulness when solving the problem. Shows understanding when solving the problem. Attempts to solve the problem. Visualization: Creates visual representations to solve problems Uses insightful visual representations that lead to an effective solution. Uses meaningful visual representations that lead to a workable solution. Uses simple visual representations that lead to a general solution. Uses unclear visual representations that lead to an inaccurate solution.