Question

Give reason
(i) The cars, airplanes & rockets streamlined.
(ii) Spark produced during sharpening of knife against a grinding wheel. (iii) The sliding friction is less than the static friction

Answer 1

Answer:

1.) The cars, airplanes & rockets streamlined.

Ans: Fast-moving vehicles are given streamline shape as their streamlined shape cuts through the air very easily and thus increased their speed. The streamlined shape is given to aeroplanes in the air and ships in the water to reduce the fluid friction.