Why?
(a) Machines are oiled from time to time.
b) An object thrown upwards comes down after reaching a point.
(c) Powder is sprinkled on a carrom board.
(d) The ramp at a railway station has a rough surface.
Answers
Explanation:
1 A machine is oiled from time to time to reduce friction between its body parts. By doing so, the life span of a machine increases.
2 An object thrown upwards comes down after reaching a point. This is because of the Earth's gravitational pull.
3 Powder is sprinkled on a carom board to reduce friction between the striker/carom coins and the carom board.
4 The ramp on a railway station has a rough surface to increase friction so that we do not slip while walking on it
Explanation:
1 A machine is oiled from time to time to reduce friction between its body parts. By doing so, the life span of a machine increases.
2 An object thrown upwards comes down after reaching a point. This is because of the Earth's gravitational pull.
3 Powder is sprinkled on a carom board to reduce friction between the striker/carom coins and the carom board.
4 The ramp on a railway station has a rough surface to increase friction so that we do not slip while walking on it