Question

A brass ball is hanging from a stiff cotton thread. Draw a neat labelled diagram showing the forces acting on the brass ball and the cotton thread.

Answer 1

Let the mass of the brass ball be $m$. So a gravitational force $mg$ acts the ball in the downward direction.

A tension force $T$ acts on the ball in the upward direction to make the ball to remain in equilibrium.

For equilibrium :

$T=mg$