Question

Steve is whirling a rubber cork, tied with a string to his finger, over his head as shown in the figure. The motion of the cork is similar to the motion of a planet in the Solar System around the Sun. Which force in the Solar System is similar to the tension in the string?

A) Nuclear force
B) Magnetic force
C) Gravitational force
D) Electrostatic force

Answer 1

gravitational force because the gravist of when your swinging it is like the sun pulling the planets in

Answer 2

To rotate an object in a circle object needs centripetal force

in above example tension is providing centripetal force

in case of sun and planet there is no string

but we have gravitational force acting between them which is attracting force

so here Sun is applying an attractive force on the planet which provides the centripetal force

This force is gravitational force between the sun and the planet