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 Aug 11 comment Convert an equation for acceleration into one for velocity possible duplicate of How to get distance when acceleration is not constant? Aug 11 comment Resultant center of rotation due to multiple moments You can with force. You can't with moment only. When a body rotates about a pin under the influence of a moment, it is the reaction forces of the pin that move the center of mass. Aug 11 revised Resultant center of rotation due to multiple moments added 837 characters in body Aug 11 answered Resultant center of rotation due to multiple moments Aug 11 comment Resultant center of rotation due to multiple moments @KyleKanos because an electric drill does not produce a pure moment. In fact it is quite difficult to produce a pure moment without a net force. Aug 9 answered Which moment of intertia do I need to calculate torque Aug 8 comment Which moment of intertia do I need to calculate torque Does the pivot axis pass through the center of mass ? Aug 8 comment Can photons accelerate? Maybe, but transverse acceleration has units of $m/s^2$ and angular acceleration of $rad/s^2$. Aug 7 comment the final velocity non-constant acceleration See physics.stackexchange.com/a/15620/392 for the math of calculating motion with non-constant acceleration. In your case the acceleration is a function of distance, so $$\frac{1}{2} v^2 = \int a \,{\rm d} x$$ Aug 7 comment Can photons accelerate? Transverse acceleration is acceleration perpendicular to the direction of motion causing the path to curve. It is equal to $\frac{c^2}{r}$ where $r$ is the radius of curvature. Aug 7 comment Can photons accelerate? Wouldn't that be transverse acceleration and not angular acceleration? Aug 7 comment Can photons accelerate? Photons slow down when entering dense media. So they must accelerate afterwards when they leave. Aug 5 answered How do I know what variable to use for the chain rule? Aug 5 comment Why aren't all points on a rolling ball moving? Any body moving in a plane will have one point with no instantaneous velocity. This point might be on the body, or away from the body. At that instant all distances from the points on the body to this point remain constant. The body spins about this point. Aug 4 answered Why aren't all points on a rolling ball moving? Aug 4 revised Why aren't all points on a rolling ball moving? added 8 characters in body Aug 4 comment Creating a structural dynamic model using only modal test data I think I did this in college with an impact hammer connected to a computer which reconstructed the modal shapes. See youtube.com/watch?v=tBRjPN8m6zE Aug 4 comment Creating a structural dynamic model using only modal test data Isn't $\phi^\intercal K \phi$ a matrix with the natural frequencies in the diagonals. So you can construct this experimentally by finding said natural frequencies. Aug 2 revised Is torque still a vector in 2 Dimensions? edited body Aug 2 answered Is torque still a vector in 2 Dimensions?