Bouncy balls

 Bouncy projectiles Essay

Supplies By Design and style

Alexandra Bermudez

CHM 2045L - 026

Michael Mclean

September 19th, 2013



Once we were when small children who loved to play, we came across a plaything which amused us simply by its speedy movement when we threw that against the flooring or any hard surface. This toy is known as the bouncy ball. Usually bouncy golf balls are made of organic rubber, ways have been present in which bouncy balls may be made from leather, plastics, and other types of polymers. In this experiment all of us created not only any standard bouncy ball, but 1 whose supplies are not harmful to the environment. In other words, we came up with the perfect earth-friendly bouncy ball. The supplies we accustomed to create this kind of eco-friendly ball were polyvinyl alcohol (PVA) and polyvinyl acetate (PVAc) and we responded them with salt borate (borax). Polyvinyl acetate (PVA) can be described as water-soluble synthetic polymer. They have the idealized formula [CH2CH]d. Polyvinyl acetate (PVA) is a synthetic botanical polymer. The chemical formula of this aspect is (C4H6O2)n. The last part is salt borate (Borax). It is an significant boron chemical substance, a vitamin, and a salt of boric acid. The chemical substance formula for sodium borate is (Na2B4O7В·10H2O). In this test, both the salt borate (Borax) and polyvinyl alcohol (PVA) were independently diluted in water to form a solution of 4% m/v. This research was executed in such a way that we-took into consideration the person who will in the foreseeable future buy the bouncy ball and play with it, as well as the environmental conditions where our last product could be exposed. Having this at heart lead all of us to create the ideal bouncy ball with the right volume of rebound rate and tolerance to weather conditions. Our outcome is actually a bouncy ball which will make to get a fun and interesting play session in any environmental setting.


Our test was composed of three several trials in which we combined our components to make a bouncy ball, and tested the bounciness from the ball after and before it was placed in water. Each trial contains dropping the ball ten-times before placing the ball in water, and 10 times following your ball was in contact with drinking water. For both these we computed the average. To get our third and final trial we all tested the bouncy ball after it was placed in water, in snow, and in heat. In every single trial all of us also changed up the quantity of polyvinyl alcohol (PVA), polyvinyl acetate (PVAc), and sodium borate (Borax) all of us used. Through the entire process cornstarch was likewise incorporated in the mixture. The materials, process and results for each trial are displayed below.

Elements Provided

Answer of polyvinyl alcohol (4% m/v)

Polyvinyl acetate stable

Solution of sodium borate (4% m/v)




Measure away 1 milliliters of sodium borate (borax) and place that in a plastic-type material cup. Assess out a few ml of polyvinyl alcoholic beverages (PVA) and polyvinyl acetate (PVAc) and mix them in a separate cup. Put the polyvinyl alcohol (PVA) and polyvinyl acetate (PVAc) into the plastic-type material cup made up of 1 cubic centimeters of

sodium borate (Borax) Stir the mixture using a stirring fishing rod until it turns into a white, gooey, clay looking goo. Next, take the mix out of cup and commence to kneed it until it finally hardens just a little. Roll the hardened blend into a ball form. Test out the bounciness of the ball by placing 15cm against the wall with one end touching the lab table. Contain the ball from your 15 cm mark and drop this. Record how high the ball bounces. To test the ball's reaction to water, place the ball within a cup stuffed with water pertaining to 5 second and then replicate the bounciness test. Record all observations.

Number of


Height of bounce in cm just before


Height of bounce in cm after drinking water


eight cm

5 cm

a couple of

5 centimeter

7 cm


your five cm

six. 5 centimeter


7 cm

your five. 5 centimeter


almost eight cm

six cm


5 cm

5 cm


9 cm

six cm

almost 8

7. five cm

eight cm

on the lookout for

7 cm

8 cm


almost eight cm

6th cm


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