Tuesday, October 13, 2015

energy - Conceptually, what is negative work?



I'm having some trouble understanding the concept of negative work. For example, my book says that if I lower a box to the ground, the box does positive work on my hands and my hands do negative work on the box. So, if work occurs when a force causes displacement, how does negative work happen? Are my hands displacing anything?




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classical mechanics - Moment of a force about a given axis (Torque) - Scalar or vectorial?

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