A ball is allowed to roll down an inclined wooden plane from a given height. At the foot of the inclined plane, it moves on a horizontal surface, differently ‘covered’, one by one, as shown in the following figures.

DAV Solutions for Class 8 Science

In which case, is the ball likely to move the longest distance? Give reason for your answer.


In case ‘c’ (glass sheet), the ball will move for longest distance it is because,

  • glass surface is smooth
  • less interlocking
  • less friction