'This grandfather clock part moves to & fro by the action of gravity & acquired momentum'
pendulum
HERE'S 2 U: This grandfather clock part moves to & fro by the action of gravity & acquired momentum
This grandfather clock part moves to & fro by the action of gravity & acquired momentum
This grandfather clock part moves to & fro by the action of gravity & acquired momentum
HERE'S 2 "U"
pendulum
HERE'S 2 "U"