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Hair physics
Aug. 31st, 2010 04:45 pmI put my hair in a bun yesterday, and it gave me a crick in my neck. I realized a few things.
1) I have a lot of hair. It's almost as long as it was back in college. Coupled with the fact that I have really thick hair, it can be rather heavy.
2) My neck doesn't care so much about the mass of my hair as it does its moment of inertia. I can wear my hair down or in a ponytail and my neck doesn't get sore. I put it up in a bun, and now all the weight is in a 6-inch ball at back of my head, and its effective torque on my neck (mass times distance) is a lot bigger. Imagine holding a bag of groceries with your arm straight down versus extended out from your body.
3) I am a big old physics nerd. I'm so pleased with myself.
1) I have a lot of hair. It's almost as long as it was back in college. Coupled with the fact that I have really thick hair, it can be rather heavy.
2) My neck doesn't care so much about the mass of my hair as it does its moment of inertia. I can wear my hair down or in a ponytail and my neck doesn't get sore. I put it up in a bun, and now all the weight is in a 6-inch ball at back of my head, and its effective torque on my neck (mass times distance) is a lot bigger. Imagine holding a bag of groceries with your arm straight down versus extended out from your body.
3) I am a big old physics nerd. I'm so pleased with myself.
