The second Friedmann equation is sometimes named for this quantity and relates it to density plus three times the pressure.
The second Friedmann equation is sometimes named for this quantity and relates it to density plus three times the pressure. This quantity and charge are both squared in the numerator of the Larmor formula. A type of this quantity named for Fermi is experienced by a particle trapped between two magnetic mirrors. This quantity is the second derivative of position and the first derivative of velocity with respect to time. For 10 points, name this quantity measured in meters per second squared that appears in Newton's second law, and is equal to force divided by mass. 
The second Friedmann equation is sometimes named for this quantity and relates it to density plus three times the pressure.
acceleration 