- Drag the pendulum bob to one side and release.
- The bob will (i) oscillate, or
(ii) undergo a complete or incomplete circular motion, depending on
the level of release and whether or not the pendulum is interrupted
by the pin.
(1) All frictional forces are negligible.
(2) The string is inextensible.
(3) The radial velocity of the bob will disappear instantly when the string becomes straight after
a free fall.