If you push on a spoke closer to the axle, the angular acceleration will be smaller. The more massive the wheel, the smaller the angular acceleration. The greater the force, the greater the angular acceleration produced. There are, in fact, precise rotational analogs to both force and mass.įigure 10.10 Force is required to spin the bike wheel. These relationships should seem very similar to the familiar relationships among force, mass, and acceleration embodied in Newton's second law of motion. The first example implies that the farther the force is applied from the pivot, the greater the angular acceleration another implication is that angular acceleration is inversely proportional to mass. Furthermore, we know that the more massive the door, the more slowly it opens. For example, we know that a door opens slowly if we push too close to its hinges. In fact, your intuition is reliable in predicting many of the factors that are involved. If you have ever spun a bike wheel or pushed a merry-go-round, you know that force is needed to change angular velocity as seen in Figure 10.10. Students are expected to do calculations with a fixed set of extended objects and point masses. Students are expected to do qualitative reasoning with compound objects.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |