Have you gotten to play much with silly putty? Hit a small bit with a hammer some time. It shatters like glass, producing powder, which then balls back up into putty. There are apparently serious suggestions to deploy speed bumps filled with rheopectic material, because if you're going the recommended speed it'll just flatten, but if you're going fast it'll speed bump. When I was involved with the physics teaching project, we'd half-fill a rubbermaid container with oobleck (we called it mung) and then lower a kid into it, saying "stomp your feet as fast as you can!" and the kid would be able to stand on it until he got tired, at which point, whoops, knee-deep!
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timeasmymeasure
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Have you gotten to play much with silly putty? Hit a small bit with a hammer some time. It shatters like glass, producing powder, which then balls back up into putty.
There are apparently serious suggestions to deploy speed bumps filled with rheopectic material, because if you're going the recommended speed it'll just flatten, but if you're going fast it'll speed bump.
When I was involved with the physics teaching project, we'd half-fill a rubbermaid container with oobleck (we called it mung) and then lower a kid into it, saying "stomp your feet as fast as you can!" and the kid would be able to stand on it until he got tired, at which point, whoops, knee-deep!