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Standard XII

Physics

Friction General Understanding

A block of ma...

Question

A block of mass $60$ kg just slides over a horizontal distance of $0.9$ m. If the coefficient of friction between their surface is $0.15$ then work done against friction will be

79.4

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97.54

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105.25

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None of these

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Solution

The correct option is A $79.4$ J
Work done $= F r i c t i o n f o r c e \times d i s t a n c e$
$= 0.15 \times 60 \times 9.81 \times 0.9$
$= 79.4 J$
Hence, the answer is $79.4 J .$

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A block of mass 60kg just slides over a horizontal distance of 0.9m. If the coefficient of friction between their surface is 0.15 then work done against friction will be

The correct option is A 79.4JWork done =Frictionforce×distance =0.15×60×9.81×0.9 =79.4JHence, the answer is 79.4J.

A block of mass $60$ kg just slides over a horizontal distance of $0.9$ m. If the coefficient of friction between their surface is $0.15$ then work done against friction will be

The correct option is A $79.4$ J
Work done $= F r i c t i o n f o r c e \times d i s t a n c e$
$= 0.15 \times 60 \times 9.81 \times 0.9$
$= 79.4 J$
Hence, the answer is $79.4 J .$