Question

A stone tied to a string is swung in vertical circle. The physical quantity that remains constant is__________ of the stone

Answer 1

Answer:

sum of kinetic energy and potential energy remains constant

Explainton:

Earth's pull on the ball remains constant (W=mg).

Tension in the string changes along the vertical circular path.

Speed of the ball changes as sum of kinetic energy and potential energy remains constant during motion.

Speed changes, hence, centripetal force changes.