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Answer by user102111 for Rate at which a pendulum bob slows due to air...

There is extensive (100s of articles) lit. on the web regarding atmospheric drag and drag in general. A spherical bob and a very thin rod makes the problem very simple. One may use this graph:...

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Answer by Farcher for Rate at which a pendulum bob slows due to air resistance?

You will note from the answers and comments already given that this is a complicated system to analyse.Two frictional force regimes have been suggested.One is $F_D= \frac12 \rho v^2 A C_D$ the...

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Answer by user2320292 for Rate at which a pendulum bob slows due to air...

The pendulum motion is described by $\ddot{\theta} + 2 \gamma \dot{\theta} + \omega^2 \sin(\theta)= 0$, where $\theta$ is the angle from the vertical position, $\gamma$ is the dissipation coefficient,...

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Answer by Floris for Rate at which a pendulum bob slows due to air resistance?

Drag for a sphere is roughly proportional with velocity squared over a wide range of velocities (as long as the Reynolds number is reasonably large) and given by$$F= \frac12 \rho v^2 A C_D$$Where...

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Rate at which a pendulum bob slows due to air resistance?

I know that "perfect" pendulums would be able to swing forever, unperturbed by air resistance. However, since there is air resistance around us, pendulums (swinging bobs) slow down and move closer and...

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