Consider a person who spins a large grindstone by placing her hand on its edge and exerting a force through part of a revolution . In this example, we verify that the work done by the torque she exerts equals the change in rotational energy.
(a) How much work is done if she exerts a force of 200 N through a rotation of 1.00 rad(57.3º) ? The force is kept perpendicular to the grindstone’s 0.320-m radius at the point of application, and the effects of friction are negligible.
(b) What is the final angular velocity if the grindstone has a mass of 85.0 kg?
(c) What is the final rotational kinetic energy? (It should equal the work.)
Do Problems 21, 22,23,24,25, 27 & 28 on page 357 in the textbook.
With a lab partner read and execute this Slipping and Tipping Activity. It is on pages 72 - 73 in the lab book. This is not a formal lab write-up. Simply do the exercises and answer the "light-bulb" questions on paper ( per group) and hand it in.