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1) You can observe static electricity if you run a plastic comb through your hair, then place the comb near small pieces of paper. The paper is attracted to the comb. This happens because the charged comb induces an opposite charge in the paper and as opposite charges attract, the paper sticks to the comb.
2) The ramp on a railway station has a rough surface to increase friction so that we do not slip while walking on it. If the surface is smooth, then the frictional force between the ramp and the feet becomes less and the chances of slipping are greater.
3) The machines working on mechanical force should work efficiently. If they are not oiled, the frictional force may be created beetween the surface should work efficiently. If frictional force is more it will slow down the speed and efficiency of the machine, therefore. machine are oiled from to time to time.
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