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Hi, I'm Jennifer Parsons, a 5th grader in Ms. Susan Caton's class at Green Valley Elementary

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School in Boone, North Carolina.

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We performed an experiment on thrust.

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My classmates and I asked ourselves, does weight affect thrust and acceleration?

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Our hypothesis is, if enough weight is added to the balloon, then the thrust will not be

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able to lift the balloon.

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Here is what you will need for the project, a balloon, a straw, a string, 30 paper clips,

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masking tape, a cup, 3 oz. size, scissors, and a hole punch.

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First, measure the distance from the ceiling to the floor.

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Add 15 cm to that measurement and cut a length of string for that amount.

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Tape or tie the string to a spot on the ceiling.

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Thread the straw into the string, stretch the string taut, and tape it to the floor.

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Take the cup and using a hole punch, punch 3 holes evenly spaced around the top of the

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cup.

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Now, cut 3 pieces of string 30 cm long.

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Tie one string to each hole in the cup.

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Blow the balloon up, but don't tie it off.

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Position the cup underneath the balloon and tape the other end of the string to the balloon

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so that it looks like a hot air balloon with a basket under it.

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Tape the balloon to the straw, lower it to the floor, count down, and release.

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3, 2, 1, blast off!

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Yay!

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Mark how high the balloon rose on the string.

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Measure and record your data.

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Blow the balloon up again.

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Make sure it's the same size as before, but this time add 5 paperclips to the basket.

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Lower the balloon, count down, and release.

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With each trial, add 5 paperclips.

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What happened to the height of the launch as you added weight?

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Here's what we concluded from our data.

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As we added more paperclips, our balloon didn't shoot as high.

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What did this experiment tell you about thrust?

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Take a close look at our data.

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As we added more paperclips, our balloon lost a lot of power and it wasn't able to shoot as high.

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We concluded the heavier the plane, the more thrust you need.

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Okay, thanks for your help!

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Well, ask Dr. D how vertical thrust relates to an airplane.

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Bye!

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From the Y-Files Kids Club at Green Valley Elementary School in Boone, North Carolina.