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Questions  >>  JEEMAIN and NEET  >>  Physics  >>  Class11  >>  Laws of Motion
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The contact force exerted by a body A on another body is equal to the normal force between the bodies, we conclude that 1) surface must be smooth 2)force of friction between two bodies may be equal to zero 3) magnitude of normal reaction is equal to that of friction 4) bodies may be rough

$\begin{array}{1 1} 2\;and\;4 \\ 1\;and\;2 \\ 3\;and\;4 \\ 1\;and\;4 \end{array}$

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