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183_notes:ucm [2021/02/15 17:25] – bartonmo | 183_notes:ucm [2021/02/18 21:09] – [Uniform Circular Motion] stumptyl | ||
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- | ===== Uniform Circular Motion ===== | + | ====== Uniform Circular Motion |
- | There are times when you will observe systems that move around some central axis in a very regular fashion. For example, the Moon revolves around the Earth in an orbit that is nearly circular. In doing so, it moves with nearly the same speed (not velocity!) at every location in its orbit. A system whose motion can be modeled as moving in a circular orbit at constant speed is said to execute " | + | There are times when you will observe systems that move around some central axis in a very regular fashion. For example, the Moon revolves around the Earth in an orbit that is nearly circular. In doing so, it moves with nearly the same speed (not velocity!) at every location in its orbit. A system whose motion can be modeled as moving in a circular orbit at constant speed is said to execute " |
- | === The Net Force for Uniform Circular Motion === | + | ==== The Net Force for Uniform Circular Motion |
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and always points towards the inside of the circle. This is the direction that net force needs to be to keep the object moving in a circle. This [[http:// | and always points towards the inside of the circle. This is the direction that net force needs to be to keep the object moving in a circle. This [[http:// | ||
- | === The Centripetal Force is not a Real Force === | + | ==== The Centripetal Force is not a Real Force ==== |
A force quantifies the interaction between pairs of objects. By this definition, the " | A force quantifies the interaction between pairs of objects. By this definition, the " | ||
The real forces are the interactions (real pushes and pulls) that give rise to the net force. It is just for the case of uniform circular motion that the net force can also be calculated using the the change in momentum, which takes on the $mv^2/R$ form. You might find many examples on the internet and (even in some books!) that claim otherwise, but the centripetal force does not result from the interaction of a pair of objects - it's not a real force. | The real forces are the interactions (real pushes and pulls) that give rise to the net force. It is just for the case of uniform circular motion that the net force can also be calculated using the the change in momentum, which takes on the $mv^2/R$ form. You might find many examples on the internet and (even in some books!) that claim otherwise, but the centripetal force does not result from the interaction of a pair of objects - it's not a real force. |