- Rotational Kinetic Energy In This Last Section Of The Lab You Will Explore Rolling Kinetic Energy The Setup Will Be Th 1 (761.34 KiB) Viewed 14 times
Rotational Kinetic Energy In this last section of the lab, you will explore rolling kinetic energy. The setup will be the same as in Part II, except that you will be rolling soup cans down the inclined plane. You will also want to use a significantly smaller angle of incline than was used in Part II. In the previous section of the lab, you saw that for translating objects that the work done on the object by friction was equal to its change in energy. You are now going to be considering rolling objects. The setup is shown in the picture below. The goal of this section is twofold: (1) to relate the velocity of a point at the edge of a rotating object to the speed of the center of the object, and (2) to use conservation of energy to determine the moments of inertia of two different cans of soup. no magchu For this section, we will ignore friction (rolling friction is usually much smaller than static or kinetic friction). Use conservation of energy and the relationship between angular speed and translational speed to write an equation relating the speed to the distance that the can rolls down the plane. What needs to be measured to determine the moment of inertia? Get two cans of soup that have approximately the same mass and the same radius. One can should be a liquid soup, like Chicken Noodle or broth, and the other should be a very thick soup, like Cream of Mushroom. Measure the mass and radius of both cans. Then, cover either the top or bottom lid of each can with Painter's tape. On one of the cans, attach a small piece of colored paper that is not blue ther red or green is best) to the immediate edge f the lid that has the blue tape on it, as shown below: Set up your inclined board with a very gradual incline, approximately 5° with respect to the horizontal. • Set up a camera to be able to record the motion of the box down the track. Using the can with the small piece of paper stuck to the top, release the can from rest near the top Rotational Kinetic Energy Use conservation of energy and the relationship between angular speed and translational speed to write an equation relating the speed to the distance that the can rolls down the plane. What needs to be measured to determine the moment of inertia? Make a plot of the speed of the can as a function of distance for each angle of incline for the board. Does your result agree with what you expect? Explain. Make a plot of the speed of the can vs. the angular speed for each angle of incline of the board. Does the result agree with what you expect? Explain. Make a table of the average moment of inertia as a function of height for both types of soup. Do both cans have the same moment of inertia? Why or why not? Was one of the cans faster than the other? Why or why not?