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Bouncing Putty
Looking for a synthetic rubber during the Second World War, James Wright at General Electric heated silicone oil with boric acid. The result was no rubber: it bounced, shattered under a hammer, stretched like toffee when pulled slowly and slumped into a puddle overnight. Nobody found an industrial use; in 1950 it was sold as a toy.
**US 2,541,851**, "Process for making puttylike elastic plastic, siloxane derivative composition containing zinc hydroxide", Wright, assigned to General Electric, filed 23. December 1944, granted 13. February 1951: liquid dimethylsiloxane heated with 5 to 25 % by weight of a boron compound such as boric acid or borax.
**You measure both of its lives**: how high it bounces, how fast it flows, and where one turns into the other.
Iniciante
1 hour plus a day of slumping
Instruções
1
1
Weigh a ball
Weigh a ball
Weigh out 20 g of bouncing putty and roll it into a smooth ball between your palms.
Materiais para este passo:
Massa saltitante20 gFerramentas necessárias:
Balança digital de precisão2
2
Bounce it
Bounce it
Tape a tape measure up a wall. Drop the ball from 1.0 m onto a hard floor five times, filming in slow motion, and read each rebound height.
Materiais para este passo:
Fita de máscara1 roloFerramentas necessárias:
Fita métrica
Telemóvel com vídeo em câmara lenta3
3
Pull slow, pull fast
Pull slow, pull fast
Roll a 10 mm thick rope. Pull one over 10 seconds: it strings out. Pull another sharply: it snaps with a clean face. Try pull times in between and note the fastest pull that still stretches.
Ferramentas necessárias:
Cronómetro
Régua metálica4
4
Strike it
Strike it
Glasses on. Set a ball on a hard surface and hit it once, sharply, with the mallet. It cracks rather than squashing. Squash another slowly with your thumb.
Ferramentas necessárias:
Maço de borracha
Óculos de segurança transparentes5
5
Let it slump
Let it slump
Re-roll the 20 g ball and set it on wax paper on a level surface. Measure its diameter now and after 10, 30, 60 and 180 minutes and 24 hours.
Materiais para este passo:
Papel encerado1 folhaFerramentas necessárias:
Paquímetro digital de 6 polegadas6
6
Deborah numbers
Deborah numbers
A carregar o notebook Jupyter…
7
7
History & Context
History & Context
**What the patent specifies:** liquid dimethylsiloxane heated with 5–25 % of a boron compound until putty-like. **Modern build (derived):** commercial bouncing putty, measured.
It became a famous toy and a staple of physics teaching about materials that are neither simply solid nor simply liquid. Its limits: it picks up dirt, will not hold a shape, and flows out of any container that is not closed.
Materiais
3- 20 gReferência
- 1 roloReferência
- 1 folhaReferência
Ferramentas necessárias
8- Referência
- 1 vendor sell this, none ship to you yetReferência
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