Machine Design 2 January 12, 1993

List of Materials:

• 5 feet of string
• 1 soda straw
• 4 orange juice containers
• 1 coat hanger
• 2 balloons
• 1 each 8 x 10 piece of foam core
• 1 rubber band
• 4 fiat head nails
• tape
• fast dry glue

List of Tools:

• Hammer
• Scissors
• Construction knife
• Pliers

Description:

Design and construct a device that will trace one or more circles around a stationary pole/mast that will be provided to you. The device must be powered only by the two balloons.

Rules:

Only the materials provided may be used. This device may only be set in motion by the thrust generated by the balloons. the project must make at least one if not more circles around the pole. It must finish with all the materials that It begins the task with. The device must be designed and manufactured within an hour.

Contest:

For the contest, each group wilt be allowed three attempts to complete as many circles as possible. The contest will be graded primarily on the number of circles, partial and complete, accomplished. Overall aesthetics of the solution will be judged as well.

Judging:

The contest judges will inspect each machine to determine if the contest rules have been satisfied.

Physics or Engineering Principle demonstrated:

This contest demonstrates the laws of force and friction. It also emphasizes structure, design and potential energy stored In the balloons to develop propulsion. the project also encourages a student team to brainstorm creatively towards a collective solution.