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Science Fair Project

By: Annie Huang & Vivian Zhu
by

vivian zhu

on 30 November 2012

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Transcript of Science Fair Project

Balloons Everywhere Three centuries ago, Sir Isaac Newton formulated the laws of motion and gravitation. It all started when an apple fell from a tree, and this inspired him to figure out how objects move towards the earth. To have a better understanding of this concept, we did out science fair topic to be about the factors that affected objects from falling. To do this experiment, we tested if the height in which we drop the balloons would affect the whether or not it pops. The factors we researched and observed were the shape of the balloon and the drag it creates, drop velocity, material the balloon is made out of and the amount of water we put in each balloon. Introduction Purpose: To observe what factors affect the probability of the balloons popping. (Ex. shape of balloon, amount of water, drop velocity, drag, and the material of the balloons)
Question/Hypothesis: Does the height in which we drop the balloon affect whether or not it pops? Materials - Tape measure
- 40 water balloons of the same size
- Water
- Ladder
- Date sheet
- Piece of paper and pencil
-Camera (to record videos) Procedure 1. Fill the same amount of water in each water balloon (40) & tie them tightly.
2. Place ladder in an area with a flat surface where you can drop the water balloons.
3. Using a measuring tape, measure the height at 1m, 1.5m, 2m and 2.5m.
4. Mark a spot to record where each height is.
5. Set up your tripod and camera at approximately 3-4 m away from the ladder.
6. Climb on ladder and get your friend/helper to hand you the balloons.
7. Record the experiment with the camera.
8. Drop 10 balloons at each height and record whether each balloon popped or not on your data sheet. During the experiment, we recorded on a data sheet whether the balloon popped or not. We discovered that for our first two measurements (1m and 1.5m) none of them popped and for our last two measurements (2m and 2.5m) they all popped. Data & Results In our results, we found that none of the balloons popped when we dropped it at 1m and 1.5m, but they all popped at 2m and 2.5m. The weight of each balloon that we filled up were approximately 0.8 lbs. They were shaped like a rain drop and the texture was rubbery, smooth and squishy. We researched the factors that affected whether the balloons would pop or not. We found that when an object moves through air, it has to push the molecules out of the way. This creates a resistance force, or drag on the moving object. Since the water balloons we dropped were fairly small and oval shaped, there was a greater force of drag. The drag also depends on the roughness of an object; a smooth, waxed surface produces less drag than a roughened surfaced object. Balloons are typically made out of materials such as rubber, latex, polychloroprene, or nylon fabric. Therefore, they did not create as big of an impact when they dropped to the ground. Also, there wasn't enough force to pop the balloons. As the balloon makes contact with the ground, gravity compresses the balloons, making a pancake-like shape and popping. The more the balloon is compressed, the greater the splatter. We noticed that the balloons dropped from a higher height created larger splatters because the acceleration of speed causing them to become more compressed as they hit the ground, unlike the balloons dropped at lower heights. Water balloons are made out of rubber, thus they have a smooth, rubbery texture. We also found that the higher the velocity, the greater the acceleration of the speed in which the balloon drops, thus creating larger diameter of splatters. At a higher height, the balloons are able to pick up more speed, creating a greater impact as it hits the ground. While, at lower heights, such as the 1m and 1.5m in which we dropped the balloons weren't able to pick up as much speed as the balloons dropped at 2m and 2.5m. Conclusion In conclusion, our hypothesis was proven. Through the ten trials of our experiment, we discovered what affected the probability of the balloons popping. How objects moving through air push the molecules out of the way, the texture of the objects, and how high the velocity would result in a greater drag. Therefore, the height in which we drop the water balloon does affect whether or not it pops. Analysis
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