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2015-02-09T21:36:29+05:30

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By making the surface rough 
incresing the mass of the object thats moving
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2015-02-10T00:57:13+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.
Friction can be increased by increasing surface rouhgness
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