09_23_Forces - Be explicit about which of Newton’s laws...

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A B m 1 2 Physics 211 9/23 HW Handout Due Thursday 9/26 Fall 2002 2 nd Law The following is a qualitative thought experiment without calculations. To receive full credit, you must draw free body diagrams and use them to explain your reasoning in each part. Make your free body diagrams consistent with Newton’s second law and with each other. Label all forces as shown in lecture and show relative magnitudes with arrow length. When you get to the end you may need to adjust the arrow lengths in some of your previous diagrams. The figure at right shows two carts, connected by a string 1. String 2 runs over a massless, frictionless pulley to a hanging mass. Ignore any friction. Cart A is held stationary by the hand. i) Compare the tension in string 1 to the tension in string 2?
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Unformatted text preview: Be explicit about which of Newton’s laws applies. Explain using a free body diagram of one of the objects. ii) State how you would calculate the tension in the strings. Now cart A is released and the system accelerates. iii) Compare the tension in string 1 to the tension in string 2 as the system accelerates. Explain using a free body diagram of one of the objects. iv) How does the tension in string 2 change when the hand releases the system? Explain using a free body diagram of one of the objects. v) How does the tension in string 1 change when the hand releases the system? Explain. Hint: You may need to adjust some of your lengths in previous parts for consistency to see the answer. i) ii) iii) iv) v)...
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