# Balloon Drive Design Challenge - PowerPoint PPT Presentation

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Balloon Drive Design Challenge. Problem. Make a Mylar balloon hover (neutrally buoyant) Neutral buoyancy is when the force pulling down ( gravity ) is equal to the force floating up ( lift ), so the balloon doesn’t move up or down. . Materials. 1 helium filled Mylar balloon Paper

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Balloon Drive Design Challenge

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## Balloon DriveDesign Challenge

### Problem

• Make a Mylar balloon hover (neutrally buoyant)

• Neutral buoyancy is when the force pulling down (gravity) is equal to the force floating up (lift), so the balloon doesn’t move up or down.

### Materials

• 1 helium filled Mylar balloon

• Paper

• Paperclips

• Tape

• Cardboard or Card Stock

### Brainstorm

• How can you stop a balloon from floating upward?

• How will you know when your balloon is neutrally buoyant?

• Once your balloon hovers, how can you move it?

### Design and Build

• To do this, you must balance lift and gravity.

• When it floats in the same place for about 5 seconds, you’ve done it!

### Test

• Explore air pressure –Use a piece of card stock to drive your balloon.

• What moves your balloon best –One stroke right next to the balloon? Big swoops? Fanning? Quick swipes?

• Hint: When you sweep the cardboard beside the balloon, you temporarily remove some air. Other air nearby rushes in to fill the space, carrying the balloon with it.

### Make it move!

• Design an obstacle course for your balloon! Drive the balloon up and over or in between objects – chairs, tables, or a friend!

### Inside the Engineering

• Balloons drift wherever the wind takes them. But if you add a way to control where the balloon goes, say by adding an engine, you’ve engineered a blimp!

### Problem

• Make a blimp and a jet-propulsion system so that a blimp flies straight and far under its own power.

### Materials

• Two Mylar balloons per team

• Paper

• Tape

• Balloon Pump

• Scissors

• Straws

• Latex Balloons

### Make a Blimp

• Make a blimp by rolling up a piece of paper and connecting it between two Mylar balloons.

• Make your blimp neutrally buoyant.

### Make a Jet

• Fit a straw into the balloon’s neck. Seal it tight with tape.

### Brainstorm

• Where would be a good place to attach the jet to the blimp?

• How will you inflate the balloon?

### Build, Test and Redesign

• Attach and test your jet blimp. Does it fly straight and far? If not redesign your jet blimp until you are satisfied with the results.

• Watch: