Geometry
# Cross Product of Vectors

**Torque** is vector that measures the tendency of a force to rotate an object about an axis. It is given by the formula
$\vec{\tau}=\vec{r}\times\vec{F},$
where $\vec{r}$ is the displacement vector (pointing from the axis to the point at which the force is applied) and $\vec{F}$ is the force vector. If a disc rotates counter-clockwise on a record player, as shown in the figure above, what is the direction of the torque?