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.
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.
(a) 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.
(b) An object thrown upwards comes down after reaching a point. This is because of the Earth's gravitational pull.
(c) Powder is sprinkled on a carrom board to reduce friction between the striker/carrom coins and the carrom board. The powder smoothens the surface of the board and thus the striker and coins can move on it easily.
(d) The ramp at a railway station has a rough surface so that the friction between our feet and the ground is enough for us to walk comfortably and without tripping.
(a) 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.
(b) An object thrown upwards comes down after reaching a point. This is because of the Earth's gravitational pull.
(c) Powder is sprinkled on a carrom board to reduce friction between the striker/carrom coins and the carrom board. The powder smoothens the surface of the board and thus the striker and coins can move on it easily.
(d) The ramp at a railway station has a rough surface so that the friction between our feet and the ground is enough for us to walk comfortably and without tripping.
