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# Float vs. Sink

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## Student Shelton

on 30 March 2014

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#### Transcript of Float vs. Sink

1) Bucket of water
2) Different types of balls:
a) Small air filled rubber(blue)
b) Large air filled rubber(clear)
c) Small solid rubber(red & white)
d) Small porous rubber(rainbow)
e) Medium air filled rubber(yellow spikes)
f) Large air filled rubber(basketball orange)
g)Tiny solid rubber(orange)

Problem
Does the type of ball affect whether or not it sinks or floats?
Procedure:
1. Fill a bin/bucket with water.
2. Use different types of balls.
3. Place balls in bin one at a time.
4. Observe whether balls sink or float.

Data

Float Sink
x
x
x
x
x
x
x
TYPES OF BALLS
Small air filled rubber(blue)
Large air filled rubber(clear)
Small solid rubber(red & white)
Small porous rubber(rainbow)
Medium air filled rubber(yellow)
Large air filled rubber(orange)
Tiny solid rubber (orange)

Hypothesis
Yes. The type of ball affects whether or not it sinks or floats.
The solid, heavy balls will sink and the lighter air filled balls will float.
CONCLUSION:
At the end of the experiment we got our answer. When we put the balls in the water the solid balls all sank and the air filled balls/hollow balls all floated.
We think the hollow balls floated because air is lighter than water. What we mean is:air is less dense than water. Density means how tightly packed molecules are in a substance. The molecules in air are spread apart to make it less dense. The molecules in water are packed more closely together, making it a a liquid and more dense than air.
The solid balls don't float because there is no air in them and rubber is heavier than water. Rubbber is a solid. The molecules in a solid are packes more closely together than a liquid. So then the solid balls will sink because ther are more dense than water. One ball (rainbow colored) looked solid but didn't sink. It actually had small holes filled with air trapped in them. This is called porous and that's what made it float.

Float vs. Sink
By Louis and Andy

Materials:
Small air filled rubber(blue)
Large air filled rubber(clear)
Small solid rubber(red & white)
Small porous rubber(rainbow)
Medium air filled rubber(yellow)
Large air filled rubber(orange)
Tiny solid rubber (orange)
Introduction
What do you think would happen if you threw different types of balls in a bucket of water? Do you think the type of ball would affect whether or not it sinks or floats?Do you think size matters? If you are wondering you have come to the right place. We tried it and here's what happened.
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