Motion In Two Dimensions Mech Hw 21 22 1 (363.56 KiB) Viewed 69 times
Motion In Two Dimensions Mech Hw 21 22 2 (409.65 KiB) Viewed 69 times
Name 3. An object moves clockwise along the trajectory below (top but is always directed toward point K. op view shown). The acceleration varies. On the diagram below. indicate the direction of the acceleration leration at each of the points A-G. Top view b. For each of the points A-G, state whether the object is speeding "P c. On the diagram below, draw a velocity vector for each of the points A-G. magnitudes of these vectors should be qualitatively correct. object is speeding up, slowing down, or neither. or each of the points A-G. The relative Top view Top view 4. Suppose that an object were to move at constant speed around an S-shaped curve as shown at right. The S-shaped curve is made of two half circles and a straight segment. At each of the indicated points on the diagram, draw a vector to represent the acceleration of the object. If the magnitude of the acceleration is zero at any of these points, indicate so explicitly. Acceleration vectors for constant speed
Mech HW-22 Motion in two dimensions 5. A pendulum bob swings back and forth. At the instant shown, the bob is at one of the turnaround points, point A. The other turnaround point, point B. and the bob's trajectory (dashed) are shown. a. Choose a point slightly after point A, and label it point C. Draw a vector to represent the velocity of the bob at point C. b. Determine the change in velocity vector Av between points and C. c. How would you characterize the direction of av as point moves closer and closer to point A? d. Each of the following statements is incorrect. Discuss the flaws in the reasoning. 1. "The acceleration at point A is zero. As point becomes closer and closer to point A, the change in velocity vector becomes smaller and smaller. Eventually, it becomes zero." ii. "At point A, the acceleration makes an angle with the tangent to the trajectory that is greater than 0" but less than 90' since the object is moving on a curve and speeding up." On the diagram at right, draw arrows at points A and B to indicate the direction of the acceleration at those points. (Hint: Your answer should be consistent with your answer to parts c and d.) Explain. Timorials in Introductory Physics McDermon, Shaffer, and the P.E.G., U. Wash.
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