Practice portal › Laws of Motion › Friction: Blocks, Belts and Inclines
Asked in NEET 2018 · Friction on a level surface
Idea: check the one statement that makes a claim about dimensions, since the other three are standard properties of friction.
The coefficient of friction is defined by μ=f/N.
Both f and N are forces, with dimensions [MLT⁻²].
Their ratio is therefore dimensionless: [μ]=[M⁰L⁰T⁰].
So the coefficient of sliding friction has no dimensions at all, and certainly not those of length.
That is the incorrect statement.
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