In the previous module, we briefly mentioned Friction. But, we didn't look at it in detail. Even though we don't think of it as much, friction is all around us in our daily life?

You see three scenarios here:
  • A: A block resting on a surface.
  • B: A block that is stationary even though a force is being exerted on it.
  • C: A block moving on a surface due to a force being exerted on it.
In which of these cases does the block experience friction?
  • A, B and C
  • B and C only
  • A and B only
  • C only