List of top Physics Questions on Types of forces asked in AIIMS

The force $F$ is given by expression $F=A \cos (B x)+C \sin (D t)$, where $x$ is the displacement and $t$ is the time. Then dimension of $\frac{D}{B}$ are same as that of

A body can be at rest even when it is under the action of any number of external forces. Vector sum of all the external forces is zero.

The forces, which meet at one point but their lines of action do not lie in one plane, are called