ࡱ> %/$z7 bjbjUU "67|7|lJJJJJJJ^  <^,V L  E,G,G,G,G,G,G,$`. 0k,J"k,JJ %, J J E,E,?(JJ+ J F60H^ %j)+D,0,)\*1*1+^^JJJJConservation of Angular Momentum Studio Physics I Applied Torques and Angular Momentum Give the wheel one quick pull to start it rotating. What happens to the angular velocity and hence the angular momentum of the wheel before, during, and after the application of the brief torque? Recall Newtons first law states that the center of mass of a system of particles or a rigid object that experiences no net external force will continue to move at constant velocity. State a First Law of Rotational Motion in terms of torques and angular momenta. In words and (b) As a mathematical expression Now spin the wheel by applying many brief pushes in order to approximate the application of a constant torque. What happens to the magnitude and direction of the angular velocity (and hence the angular momentum) of the wheel during the application of a steady (constant) torque? Recall that Newtons second law of motion states that the center of mass of a system of particles or rigid object that experiences a net external force will undergo an acceleration inversely proportional to its mass. Give a precise statement of a Second Law of Rotational Motion relating the net torque on an object to its change in angular momentum. (a) In words (b) As a vector equation Note: Take both magnitudes and directions of the relevant vectors into account in your statement. Using mathematical arguments, including your vector expression for Newtons second law of Rotational Motion to show that, in theory, we expect angular momentum on a system to be conserved if the net torque on that system is zero. Conservation of Angular Momentum Suppose that the wheel is spinning as shown in the first figure below (far left). What is the direction of the angular velocity vector? What is the direction of the angular momentum vector? What are the directions of these vectors for the other case shown?  EMBED Word.Picture.8  Recall that  EMBED Equation.2 . Suppose that you start a wheel spinning so that its  EMBED Equation.2  vector is pointing up and that you then flip the wheel so that its  EMBED Equation.2  vector points down. Which action do you predict will require more applied torque on a spinning wheela fast flip or a slow flip? Explain the reasons for your prediction. Start a wheel spinning fairly rapidly. Try flipping it slowly and then as rapidly as possible. What do you observe about the required torques? Did your prediction match your observations? If not, how can you explain what you observed? You should have discovered that it takes a healthy torque to change the direction of the angular momentum associated with a spinning bicycle wheel. Lets observe a more complicated situation involving a similar change of angular momentum. Consider a person sitting on a platform that is free to move while holding a spinning bicycle wheel. What do you predict will happen if a stationary person, sitting on a platform that is free to rotate, flips a spinning bicycle wheel over? Why? (Be specific. For the situation shown below, if you think the person will start to move, state what kind of movement and in what direction). Spinning wheel being flipped on rotating platform. What actually happens? Does the result agree with your prediction? Use the Law of Conservation of Angular Momentum to explain your observation in words. Hints: Remember that angular momentum is a vector quantity. Does the angular momentum of the wheel change as it is flipped? If so, how does the angular momentum of the person and stool have to change to compensate for this? Effects of Changes in Rotational Inertia In this part of the activity you will verify the Law of Conservation of Angular Momentum qualitatively by rotating on a reasonably frictionless platform with your arms extended. You can then reduce your rotational inertia by pulling in your arms. This should cause you to rotate at a different rate. This phenomenon is commonly observed for ice skaters and dancers. Since people can reconfigure themselves, they are not really rigid bodies. However, in this observation we will assume that you can behave temporarily like two rigid bodiesone with your arms extended with masses and the other with your arms pulled in with the masses. Simplified model of a human body as a combination of cylindrical shapes. Fig. 13.12.  Fig. 13.13.  Fig. 13.14.According to the Law of Conservation of Angular Momentum, what will happen to the angular speed of a person on a platform if his or her rotational inertia is decreased? Back up your prediction with equations. Try spinning on the rotating platform. What happens to your angular speed as you pull your arms in? Does it increase or decrease? If you are to verify the Law of Conservation of Angular Momentum for this situation quantitatively, you need to calculate your approximate rotational inertia in each of the two configurations. This process is an excellent review of techniques for calculating the rotational inertia of an extended set of objects. The platforms rotational inertia is Ip = 1.0 kgm2. Assume that each of your arms with the attached hand has a mass that is equal to a fixed percent of your total mass as shown in the following table. Idealize yourself as a cylinder with long thin rods as arms. Percentage of the mass of a typical persons arm and hand relative to that persons total body mass. Arm/handWomen4.8%Men5.8%Source: Stanley Plagenhoef. Patterns of Human Motion (Englewood Cliffs, NJ: Prentice-Hall, 1971), Ch. 3. Find the total rotational inertia of the rotating system consisting of you, a pair of masses held in close to your body, and a rotating platform. Assume that you can hold the 2.0-kg masses at a distance of 5.0 cm from the axis of rotation when your elbows are in. Hint: Dont forget to account for the mass and rotational inertia of the platform. Show all your work carefully. Find the total rotational inertia of the rotating system if you are holding a 2.0-kg mass in each hand at arms length from your axis of rotation. Use a meter stick to measure the length of your arms. Which part of the system has the largest rotational inertia when your arms are extended, the trunk, arms, 2.0-kg masses, or the platform? Is the result surprising? Explain. According to your calculations of the rotational inertias above, by what percent should your angular velocity change when you pull your arms in? 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