PHY 2020 Lecture Notes - Lecture 8: Moment Of Inertia, Tightrope Walking, Speed
Document Summary
Your pet (cid:498)hamster(cid:499) sits on a record player whose angular speed is constant. If the moves to a point twice as far from the center, then his linear speed is. Tangential speed~ radial distance * rotational speed * rotational speed: v~rw. Motion of inertia: it is not just the mass that matters, but where the mass is located (with respect to rotational axis) Explain why a long pole is more beneficial to a tightrope walker if the pole droops: the tendency of the pole to resist rotation aids the acrobat. A solid cylinder rolls down an incline faster than a hoop, whether or not they have the same mass or outer diameter. A hoop has greater rotational inertia relative to its mass than a cylinder does, as the mass is located further away from its rotational axis. A upright broom is easier to balance when the heavier end is: nearest your hand.
