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Answer:
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Explanation:
1. Because on rough surfaces irregularities of surface cause an interlocking due to which it creates more friction and as smooth surface has very less irregularities so it can move easily and hence less friction.
2.the area of the body that pushes air/water becomes very small. It kind of pierces through the air/water because of the small area that is pushes the air/water while traveling through it. So the air/water that needs to be pushed reduces which means less air/water to push
3. The gravel increases friction on the ground, slipping and falling down is always a factor in walking on wet lands and water, gravel helps us to increase friction with the ground which in return increases the grip and stop us from slipping or falling down on the wet ground.
4.tyres of cars wears out gradually due to friction between the tyre and the ground.
5. Friction can be defined as the force resisting the relative motion of fluid layers, solid surfaces, and material elements sliding against each other
6.a bearing in which the parts are separated by a ring of small freely rotating metal balls which reduce friction.
7.a substance used for lubricating an engine or component, such as oil or grease
8.Rolling friction takes place when an object rolls on the surface.
9.Sliding friction takes place when two surfaces are rubbed against each other.