OMPhQuiz_05_p38-45 - chapter 5 Newton's Law of Motion...

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38 PhysiQuiz Contents Static system 1. Hanging two identical masses • Context in the textbook: Section 5.3, combination of forces, Example 4. Vertical motion without friction 2. Elevator: Decelerating while rising 3. After the cable breaks . . . • Context in the textbook: Complementary to Example 6 in Section 5.5. Motion along a horizontal plane without friction 4. Pushing two blocks • Context in the textbook: Section 5.6, motion with constant force, Fig. 5.36. Motion along an incline 5. Pushing up an incline without friction • Context in the textbook: Example 9 in Section 5.6. Motion in a system with an ideal pulley. 6. Hanging weight versus pulling force 7. Moving cart with pulley and blocks • Context in the textbook: Examples 10 and 11 in Section 5.6. chapter 5 Newton’s Law of Motion
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Two identical masses are suspended symmetrically, as shown, so that T 1 , the tension along string 1, is equal to T 3 , the tension along string 3. Find T 2 , the tension along string 2: A B C D T 2 T 1 cos T 1 sin 2 T 1 cos 2 T 1 sin Extra: Now lengthen string 2. This is done both to the right and to the left while maintaining the symmetry of the setup. Will T 2 increase, stay the same, or decrease? Explanation: String 2 is pulled to the left by the horizontal component of T 1 (that is, T 1 x T 1 sin ) and to the right in equal magnitude by the horizontal component of T 3 . Because tension is defined as the magnitude of either of the pulling forces, the tension along string 2 is T 1 sin .
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