A point mass $m$ is suspended from a light thread of length $l,$ fixed at $O,$ is whirled in a horizontal circle at constant speed as shown. From your point of view, stationary with respect to the mass, the forces on the mass are

Two masses of $5\, kg$ and $10\, kg$ are connected to a pulley as shown. What will be the acceleration if the pulley is set free ($g =$ acceleration due to gravity)

Which of the following is self adjusting force?

Cream gets separated out of milk when it is churned, it is due to

Two masses of $10\,kg$ and $20\,kg$ respectively are connected by a massless spring as shown in figure. A force of $200\,N$ acts on the $20\,kg$ mass at the instant when the $10\,kg$ mass has an acceleration of $12\,ms ^{-2}$ towards right, the aceleration of the $20\,kg$ mass is: