9. Take a tray. Place a small ice cube, eraser and a rupee coin on a line at one end of the tray. Now
slowly lift this end of the trays as shown in figure.
Which of these three objects slides down first. Why?
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Answer:
ice due to less coefficient of friction as the melting water forms a layer beneath the ice enabling it to slide down easily
Explanation:
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1
Out of these three objects, the ice cube will slide down first. This is because-
- There is frictional force acting between the surface of the tray and the ice cube, eraser, and rupee coin.
- As the tray is lifted, sliding friction will act which will resist the motion.
- The object which suffers the least frictional resistance will slide down first.
- As the ice cube melts, the surface will be wet with water.
- Water has low shear and it will act as a lubricant reducing the friction between the ice cube and the tray surface.
- Hence, the ice cube will slide down first out of all three objects.
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