Two friends find it hard to start moving a heavy almirah, but once it starts sliding it is easier to keep it moving. The reason is:

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MCQ (Single)Static and Kinetic Friction

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Assertion (A): Friction opposes the relative motion between two surfaces in contact. Reason (R): Friction is a non-contact force.

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In an activity, a wooden block is pulled with a spring balance across three surfaces. The reading just as the block starts to move is: glass sheet 2 N, wooden table 3.5 N, sandpaper 6 N. (a) On which surface is friction greatest? (b) Arrange the surfaces in increasing order of friction. (c) What do you conclude about friction?

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