The force of friction acting on a car on different roads in the increasing order of magnitude will be:
A
mud, tar, concrete and gravel roads
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B
tar, concrete, gravel and mud roads
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C
concrete, tar, gravel and mud roads
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D
gravel, mud, tar and concrete roads
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Solution
The correct option is D gravel, mud, tar and concrete roads Friction is the retarding force between the surfaces in contact. Retarding force F=μR where μ is the coefficient of friction between the two surface in contact.