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1. Equilibrium
Rule (Paul G. Hewitt explains equilibrium by drawing so everyone can understand this topic.) End Question: If Burl and I both stood at a far end of the scaffold, and leaned outward a bit so the opposite rope went limp, what would be the tension in our supporting rope? |
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2. Equilibrium
Problems (Paul shows numerical values for the billboards cast.) End Question: What is the tension, in newtons, in the right-hand rope |
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3. Net Force and
Vectors (Box of candy to Nellie hanging by vertical ropes.) End Question: Will the vectors representing rope tensions (vertical ropes of different lengths) still each be 150 N? And can you defend your answer |
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4. Nellie’s Rope
Tensions (Nellie introduces parallelogram rule, then hanging by ropes at angle.) End Question: Suppose we replace this right-hand rope with a shorter rope — with a much steeper angle. Does the rope tension in the longer left-hand rope increase, decrease, or remain the same? Can you defend your answer? |
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5. Nellie’s Ropes (Tensions via Nellie hanging by non-vertical ropes.) End Question: By way of strings and pulleys, a pair of 10-N blocks pull on a scale as shown. What’s the reading on the scale? |
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6. Force Vector
Diagrams (Paul extends Jim Court diagrams, identifying forces on a suspended, then falling ball.) End Question: [In regard to a falling ball; If air resistance becomes as great as the ball’s weight, is the ball then in equilibrium? What do we say about its motion at this point? |
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7. Force Vectors
on an Incline (Paul analyzes forces acting on a block on an inclined plane, leading to forces on a block sliding on a curved surface.) End Question: At which location, A, B, or C, will the acceleration along the ramp be greatest? |
| 16. Newton's Laws
of Motion Paul enlists Nellie Newton to illustrate Newton's three laws of motion. |