- #1
PSarkar
- 43
- 2
I want to find out the general equations of motion for a particle with an initial velocity [itex]v_0[/itex] in a gravitational field by a point/spherical mass (assuming this is a large mass which doesn't move). Assume that the origin of the coordinate system is the point mass. If the vector equation of the particle's path is [itex]\mathbf{r}(t)[/itex], then the acceleration should be the second derivative,
[tex]\frac{d^2 \mathbf{r}}{dt^2}[/tex]
The acceleration is caused by the gravitaional field (acceleration field) given by,
[tex]A(\mathbf{r}) = GM\frac{\mathbf{r}}{|\mathbf{r}|^3}[/tex]
But we already have the acceleration of the particle,
[tex]\frac{d^2 \mathbf{r}}{dt^2} = GM\frac{\mathbf{r}}{|\mathbf{r}|^3}[/tex]
So the general solution for [itex]\mathbf{r}[/itex] can be found by solving the above differential equation but I couldn't do it. Can anyone show me how it is done?
[tex]\frac{d^2 \mathbf{r}}{dt^2}[/tex]
The acceleration is caused by the gravitaional field (acceleration field) given by,
[tex]A(\mathbf{r}) = GM\frac{\mathbf{r}}{|\mathbf{r}|^3}[/tex]
But we already have the acceleration of the particle,
[tex]\frac{d^2 \mathbf{r}}{dt^2} = GM\frac{\mathbf{r}}{|\mathbf{r}|^3}[/tex]
So the general solution for [itex]\mathbf{r}[/itex] can be found by solving the above differential equation but I couldn't do it. Can anyone show me how it is done?