# Tag Info

### How can I determine the rpm of a wheel that's spinning really fast?

There's a very interesting way to find the angular velocity of a wheel that's spinning so fast that you can't measure using a stopclock. We'll be using a strobe light (a light that flashes on and off ...
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### Why are angular mometum and angular velocity not necessarily parallel, but linear momentum and linear velocity are always parallel?

Note that this answer, like the tags of the question, is only focusing on Newtonian mechanics. The definition of linear momentum $\mathbf p$ is expressed in terms of the linear velocity $\mathbf v$ ...
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