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A tag for questions about the mechanical interactions of rotating objects, including torque and angular momentum.
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Applied Force in a Non-inertial Frame
Let us consider two reference frames: $S$ and $S'$. $S$ is an inertial frame and $S'$ is a non-inertial frame as it is rotating wrt $S$ with an angular velocity $\omega$ about a fixed axis. The origin …
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The $r$-component of the Total Force on a Simple Pendulum
Let us consider a simple pendulum in vacuum. Its bob has a mass $m$. There are two forces acting on the bob: the tension of the string $\textbf{T}$ and the uniform gravitational force, $\textbf{W} = m …