PPT-L-10(M-9) torque and rotational inertia

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 rotate. 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 . (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. 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 . 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?. 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 . 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?. 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 . 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 . a = r. α. F = . mr. α. . Στ. = r . Σ. F . = . Σ. mr. 2. α. Moment of Inertia (. . I ) – sum of rotational inertia of an object. I = . Σ. mr. 2. . Στ. = I . α. Equation. Rotational Dynamics. Practice Problems. Newton’s 2. nd. law involving rotations. Practice Problem #2. A person exerts a force of 45.0 N on the end of a door 84.0 cm wide. What is the magnitude of the torque if the force is exerted:. 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 .