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2014-10-06T14:31:18+05:30

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Use of ball bearings
Use of air cushions
Oiling or greasing
Using anti-frictional alloys 
Polishing
Streamlining objects
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2014-10-06T14:38:54+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Some basic techniques used to reduce friction:
1.Polishing :
  If surfaces are polished irregularities are removed and there by friction   decreases.
2. Use of ball bearings:
  Ball bearings convert the sliding friction into rolling friction.Hence, the friction is     reduced.
3. Use of Lubricants:
  Lubricants fill the irregularities of the surface and there by the friction is reduced.
4. Stream lining :
  Stream lining is done to reduce friction due to air.
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