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

Conservation of rotational momentum 1 Why does a wheel keep spinning Spinning ice skater Video 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. The unit vectors 1 2 3 B e e e are fixed in the body and directed along a convenient set of axes pass ing through the mass center G The moments of inertia of the body about t hese axes are defined as 22 xx I y z dm 22 yy I x z dm 22 zz I x PHYS . 2010. Nathalie Hoffmann. University of Utah. Rotational vs. translational (linear). Translational/Linear Motion. Rotational Motion. Position/Displacement. Angular position/displacement. Velocity. ERCOT. . Joint . FAS/SIRS . Meeting. September 21. st. , 2015. 134 of 145 Wind Generators Responded to Wind . Emulated. . Inertia RFI.. Are there currently any Wind Generators (WGRs) providing Emulated Inertia Response (EIR) in ERCOT? . 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 . 10.1 – Angular Position (. θ. ). In linear (or translational) kinematics we looked at the position of an object (. Δx. , . Δy. , . Δd. …). We started at a reference point position (x. i. ) and our definition of position relied on how far away from that position we are.. Physics 1, NTC. Angular Motion, General Notes. When a rigid object rotates about a fixed axis in a given time interval, every portion on the object rotates through the same angle in a given time interval and has the same angular speed and the same angular acceleration.. 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?. © 2015 Pearson Education, Inc.. This lecture will help you understand:. Circular Motion . Rotational Inertia. Torque. Center of Mass and Center of Gravity. Centripetal Force. Centrifugal Force. Rotating Reference Frames. If you ride near the outside of a merry-go-round, do you go faster or slower than if you ride near the middle?. It depends on whether “faster” means . a faster . linear speed (= speed). , ie more . 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.. The more mass an object has, the greater its inertia and the more force it takes to change its state of motion. . The amount of inertia an object has depends on its . mass. —which is roughly the . amount of material. Note, all lectures and pre-lectures posted up as always at. http://www.hunter.cuny.edu/physics/courses/physics100/spring-2016. Looking ahead. : Sep 27, Review (. Chs. 2,3,4,5,6,7,8). Sep 30: Midterm .