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The Rotation About a Fixed Axis example computes the angular momentum of a rigid rectangular box attached to a rotating axle. The fixed axis is in the z-direction. Users can tilt the box relative to the axle and can change the box dimensions. The simulation shows that the angular momentum vector L is not aligned with the the angular velocity vector unless the box is rotating about an axis parallel to a box edge. The simulation also shows the torque N that must be applied to the axle to maintain its fixed orientation. Additional windows display the frame-dependent tensor algebra in an inertial reference frame fixed in space and in a non-inertial reference frame attached to the rotating box with a rotation axis parallel to a box edge.
The Rotation About A Fixed Axle model was developed using the Easy Java Simulations (EJS) modeling tool. It is distributed as a ready-to-run (compiled) Java archive. Double clicking the ejs_csm_ch17_RotationAboutFixedAxis.jar file will run the program if Java is installed.
Last Modified August 5, 2013
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The source code zip archive contains an XML representation of the Rotation About A Fixed Axis Model. Unzip this archive in your EJS workspace to compile and run this model using EJS.
Last Modified April 1, 2011