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Friction — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsFriction2 Marks
Question
Why do tyres have a better grip of the road while going on a level road than while going on an incline?
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Answer

Normal on ground is mg but on incline it is mg $\cos\theta$ so on the incline $\mu_\text{N}$ will be less and hence less gripping.

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