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Unformatted text preview: attachment to each mass this the tension would manifest itself as a vector force which is directed vertically upward. Where the string makes contact with the wheel the scalar tension manifests itself as a downward force (as though the string were attached to the wheel at this point). At each mass we would write y ma mg T a m F = = r r T is in positive y direction because the tension produces an upward force. Since the pulley does not move the sum of forces on the pulley would be written as = = T T F a m F r r where T is in the negative y direction because the force due to tension acts downward. 1 This is true in the limit of a light string. If the string has substantial mass a net force would be required to accelerate the string and assumption that the net force is zero would fail....
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- Fall '11
- LA PORTA