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2015-11-22T21:50:04+05:30

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Increasing friction:
make the surface rough (increase irregularities )
make the objects heavy (increase the mass )

decreasing friction:
by polishing
by lubrication
by streamlining
by using ball bearings and wheels
2 5 2
gd and missed a point can increase friction even by having more contact with the 2 objs  
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