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Unformatted text preview: 1 Chap 6 Force and motion II Note – this is an outline of the lecture, print this and take notes on it in lecture It is not the and take notes on it in lecture. It is not the complete lecture. You should attend lecture to get the complete notes Images taken from Halliday/Resnick/Walker, Fundamentals of Physics, 7 th Edition, John Wiley and Sons Inc., by permission. Hints: Checkpoints 2, 5 . Note that the normal force F N in these checkpoints is not mg . F N = mg only in the special case where a mass sits on a horizontal surface AND the only vertical forces present are F N and gravity. Q2 . Draw a freebody diagram of the mass. There will be a total of four forces. Now apply Newton’s 2 nd law. Note that in a), b), and c) the box has constant velocity (actually v = 0) in a), b), and c) the box has constant velocity (actually v 0) so a = 0. Q9 . If the coefficient of static friction between the block and slab is large the block accelerates with the slab and you can consider the two to be a single object. If the coefficient of static friction is zero the block remains stationary and the slab accelerates from under it. P6. Draw a freebody diagram. Apply Newton’s 2 nd law. Hints: continued P.7 Draw a freebody diagram for the block. The forces on it are the applied force, the force of gravity, the normal force of the floor, and the frictional force of the floor. Write the Newton's second law equation in component form. P21. Draw a free body diagram for the knot. Use the info given about mass B to find the maximum possible tension in the horizontal string. Use this to find the weight of A P28. Do a free body diagram for C+A and for B. Note that there is a normal force upward on masses C+A due to the surface it sits a normal force upward on masses C+A...
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 Spring '08
 oshea
 Force, Friction

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