A block of mass 1 kg is placed at the point A of a rough track shown in figure (8.E6). If slightly pushed towards right, it stops at the point B of the track. Calculate the work done by the frictional force on the block during its transit from A to B.
Work done by the frictional force = Change in potential energy of block
= Mass × acceleration due to gravity × change in height
= 1 × 10 × (0.8 – 1)
= –2J
1