'A simple one of these consists of a small weight swinging to & fro on the end of a string'
Pendulum
SCIENCE: A simple one of these consists of a small weight swinging to & fro on the end of a string
A simple one of these consists of a small weight swinging to & fro on the end of a string
A simple one of these consists of a small weight swinging to & fro on the end of a string
SCIENCE
Pendulum
SCIENCE