Disadvantage of Friction
Disadvantages of Friction
Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.
Friction is a necessary evil: A matchstick lights up due to friction against the side of matchbox when we strike it. This can destroy houses when catches fire. A tyre of wheel has rough surface to have more of a friction. If there is no friction the vehicle will skid. Friction is necessary for carrying out day to day activities because without this force we cannot set the bodies in motion or stop the moving bodies. On the other hand, friction wastes energy, brings about wear and tear and slows down motion. Thus, we can say that friction is a necessary evil as without it, we cannot do our day -to-day activities and with it we lose energy, speed.
Which of the following are correct ? (a) Friction reduces heat, the engines of cars and other machinery, therefore, become very hot after running for some time. (b) Energy is wasted in overcoming the force of friction. (c) It is due to the friction between branches of trees which rub against each other, that forest fires occur.
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| Right Option : B | |||
| View Explanation | |||
Which of the following are correct ? (a) A matchstick lights up due to friction against the side of matchbox when we strike it. (b) Friction can destroy houses when catches fire. | |||
| Right Option : C | |||
| View Explanation | |||
Which of the following are correct ? (a) A matchstick lights up due to friction against the side of matchbox when we strike it. (b) When you wear the same pair of shoes for a few months their soles wear out. | |||
| Right Option : C | |||
| View Explanation | |||
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