give examples to decrease the friction
Answers
METHODS TO DECREASE FRICTION:
1 Polishing: the interlocking and the projections between the two surfaces are minimized and therefore friction reduces.
2 Lubrication: a lubricant is a substance which forms a thin layer between the two surfaces in contact.it fills the depressions present in the surfaces in contact and hence friction is reduced.
3 Streamlining: streamlining automobiles resists air friction and hence they travel faster.
4 Avoiding moisture: when moisture is present friction is more. so avoid it!!!
5 Use of alloys: friction is reduced by lining the moving parts as alloys have low coefficient of friction
6 Use of ball bearings: the rolling friction is less than the sliding friction.so we convert sliding friction into rolling friction with the ball bearings,