Mechanics in Noninertial Reference Frames
Linearly accelerating reference frames
Let [math]\mathcal S_0[/math] represent an inertial reference frame and \mathcal S represent an noninertial reference frame with acceleration [math]\vec A[/math] relative to [math]\mathcal S_0[/math].
Ball thrown straight up
Consider the motion of a ball thrown straight up as viewed from [math]\mathcal S[/math].
Using a Galilean transformation (not a relativistic Lorentz transformation)
At some instant in time the velocities add like
- [math]\dot {\vec {r}_0} = \dot {\vec r}+ \vec V[/math]
where
- [math]\vec V[/math] = velocity of moving frame [math]\mathcal S[/math] with respect to [math]\mathcal S_0[/math] at some instant in time
- [math]\Rightarrow \dot {\vec r} = \dot {\vec {r}_0} - \vec V[/math]
taking derivative with respect to time
- [math]\Rightarrow \ddot {\vec r} = \ddot {\vec {r}_0} - \dot \vec V= \ddot {\vec {r}_0} - \vec A [/math]
- [math]\Rightarrow m\ddot {\vec r} = m\ddot {\vec {r}_0} - m \vec A= \vec F - m\vec A= \vec F - \vec {F}_{\mbox {inertial}}[/math]
where
- [math]\vec {F}_{\mbox {inertial}} = m \vec A \equiv[/math] inertial force
Forest_Ugrad_ClassicalMechanics
