A string carrying two weights is hung over a low friction bearing mounted pulley. The weights have slightly different masses, causing a uniform acceleration. When the time it more..

Here's a pretty basic overview of Friction and Newton's Laws of Motion. This was a Physics report, which I made myself. =D

Rolling friction is due to the deformation taking place at the surface of a rolling ball. It is responsible to decrease the velocity of the centre of mass of the rolling ball.

This write-up came in IIT JEE 2008 Paper-I Physics. Solution is discussed in this video.