PPT-L-11 (M-10) Rotational Inertia and

Conservation of rotational momentum 1 Why does a wheel keep spinning Why is a bicycle stable when it is moving but falls over when it stops Why is it difficult to change the orientation of the axis of a spinning wheel. Today. Finish . last slides on energy from last time. Start lecture on Rotation (Chapter 8). Looking . ahead: . On Oct 9 . is the first midterm! Will be on . Chs. . 2,3,4,5,6,7,8. . . On Oct 6, will be a review session.. We consider the rotation of . rigid bodies. . A rigid body is an extended object (as opposed to a point object) in which the mass is distributed spatially.. Where should a force be applied to make it . Angular displacement, angular velocity, angular acceleration. Rotational energy. Moment of Inertia. Torque. Chapter 10:Rotation of a rigid object about a fixed axis. Reading assignment:. Chapter 10.1 to10.4, 10.5 (know concept of moment of inertia, don’t worry about integral calculation), 10.6 to . and rotational inertia. We consider the rotation of . rigid bodies. . A rigid body is an extended object in which the mass is distributed spatially.. Where should a force be applied to make it rotate (spin)? The same force applied at . Not just a crappy movie with . Ice Cube. http://www.impawards.com/2004/posters/torque.jpg. What Torque is. Torque is a force that produces a rotation. Think about using a wrench to turn a bolt. Torque depends on TWO THINGS:. Rotational Inertia and. Conservation of rotational momentum. Why does a wheel keep spinning?. Why . is a bicycle stable . when it is . moving, but . falls. . over when it stops?. 1. Rotational inertia . Ellen Akers. Radians and Degrees. In degrees, once around a circle is 360˚. In radians, once around a circle is 2. π. A radian measures a distance around an arc equal to the length of the arc’s radius. Type of moment of inertia. Moment of inertia of Area. Moment of inertia of mass. Also known as second moment. Why need to calculate the moment of Inertia?. To . measures the effect of the cross sectional shape of a beam on the beam resistance to a bending moment. We consider the rotation of . rigid bodies. . A rigid body is an extended object in which the mass is distributed spatially.. Where should a force be applied to make it rotate (spin)? The same force applied at . and the Center of . Gravity (cont.). © 2015 Pearson Education, Inc.. Calculating the Position of the Center of Gravity. The torque due to gravity when the pivot is . at. the center of gravity is zero.. Dedra. Demaree, . Georgetown University. © 2014 Pearson Education, Inc.. Rotational Motion. How can a star rotate 1000 times faster than a merry-go-round?. Why is it more difficult to balance on a stopped bike than on a moving bike?. University of Michigan. Physics Department. Mechanics and Sound . Intro . Labs. Inclined Plane Experiment. Although it may seem daunting, rotational motion is fairly straightforward. In many ways it is analogous to the linear motion that you have studied previously. Rotational motion can be examined using the same principles of energy and momentum conservation that you have used previously. The equations that accompany these laws take a slightly different form, but at their root, they are based on the same physical principles. So begins your three part study of rotational motion which includes this lab, the rotating bar in . © 2016 Pearson Education, Inc.. Goals for Chapter 9 . To study angular velocity and angular acceleration.. To examine rotation with constant angular acceleration.. To understand the relationship between linear and angular quantities.. HTHS AP Physics 1. M. Dimler. Torque. Torque. is a force that causes an object to turn. Torque. - Force directed perpendicular to the “lever arm” of an object that has the ability to rotate the object around a fulcrum or axis. .