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Cross, Rod3
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Cross, Rod – Physics Education, 2015
The act of swinging an object such as a hammer or a tennis racket involves the application of forces and torques in a manner that is intuitively obvious to the person performing the task, but is probably much less obvious to the average physics student. This article describes the basic mechanics of the problem.
Descriptors: Science Instruction, Motion, Scientific Principles, Mechanics (Physics)
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Cross, Rod – Physics Education, 2015
Almost everyone will have observed a spinning coin fall to a shuddering stop. How and why does it do that? Several experiments are described, suitable for a student project, to help motivate an understanding of the rotational dynamics involved.
Descriptors: Science Instruction, Physics, Scientific Principles, Motion
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Cross, Rod – Physics Education, 2013
Measurements are presented on the rise of a spinning egg. It was found that the spin, the angular momentum and the kinetic energy all decrease as the egg rises, unlike the case of a ballerina who can increase her spin and kinetic energy by reducing her moment of inertia. The observed effects can be explained, in part, in terms of rolling friction…
Descriptors: Kinetics, Physics, Motion, Science Instruction