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lecture7_9_27_11

# lecture7_9_27_11 - Lecture 7 note text in red refers to the...

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Lecture 7: 09/27/11 note: text in red refers to the textbook, 9 th edition extended. 1. Uniform Circular Motion and Centripetal force section 6-5 2. Work If a person pushes a mass for a certain distance, it is clear that the total effort that the person puts into the job is proportional to both the force he/she applies, as well as the distance that the object is moved. We therefore define the work done by a force to be For the moment we are assuming that the force is a constant, and the distance that the object moves is in the same direction as the force. If we assume that the work involves pushing a mass starting from rest, the fact that we are pushing the mass with a constant force implies that the mass will have a constant acceleration given by Newton s second law . This acceleration will cause the block to gain velocity over time. After the block has traveled a distance , the magnitude of the velocity of the block will be given by ( ) So we see that the work done by the force goes into increasing the velocity of the mass. The velocity is

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lecture7_9_27_11 - Lecture 7 note text in red refers to the...

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