Give examples to show that friction is both a friend and a foe.
Explain why sportsmen use shoes with spikes.
Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor. Who will have to apply a larger force and why?
Fill in the blanks.
Friction opposes the ________ between the surfaces in contact with each other.
Suppose your writing desk is tilted a little. A book kept on it starts sliding down. Show the direction of frictional force acting on it.
Friction depends on the _________ of surfaces.
