Fluid Friction
Fluid Friction
Friction due to liquids and gases:-
Liquids and gases also exert friction on the bodies moving through them. However, they offer much less friction as compared to solid surfaces.
Friction due to water:-
When an object moves through water, it experiences the force of friction. Friction due to water is more than the friction due to air. Examples:
1. Streamlined Shape: It is a special shape i.e. narrow in front and broader in the middle of a body around which air or water can flow fast easily, offering minimum amount of frictions. The streamlined shape of bodies of fishes and all other marine animals helps them in reducing the force of friction between their body and water through which they move. The friction due to water is important for the movement of boats and ships. This is done so to offer a minimum amount of friction while moving through water.
The bodies of aeroplanes are made streamlined in order to ensure the minimum friction is produced as they move through ________________________ . | |||
| Right Option : A | |||
| View Explanation | |||
Which of the following are correct ? (a) Streamlined Shape is narrow in front and broader in the middle of a body around which air or water can flow fast easily, offering minimum amount of frictions. (b) The bodies of aeroplanes are made streamlined in order to ensure the minimum friction as they move through air. (c) Shooting stars have a very low velocity so the friction due to air is extremely low. | |||
| Right Option : A | |||
| View Explanation | |||
Which of the following are correct ? (a) The friction due to water is important for the movement of boats and ships. (b) As the friction in water is much less than that between solid surfaces, it becomes difficult to apply brakes in ships or boats . (c) All automobiles and space launch vehicles are specially designed to minimize the effect of friction of air. | |||
| Right Option : D | |||
| View Explanation | |||
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