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PART - 1 CH - 4 Laws of Motion — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysicsPART - 1 CH - 4 Laws of Motion1 Mark
Question
To stop a moving bicycle, should we apply big or small brake?
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Answer

As long as the normal reaction does not change, the friction doesn't depend on contact area, hence whether the brakes are small or big, the friction force remains the same.

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