A block of mass m is released from top of incline plane of inclination. The coefficient of friction between the block and incline surface is $μ (μ < t a n θ)$ . Find work done by normal reaction when block moves from top to the bottom.

Zero

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μ m g t a n θ

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μ m g c o s θ

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μ m g s i n θ

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Solution

The correct option is D Zero
$W_{N} = 0 ∴ F_{N} ⊥ Δ S$
$W_{g} = m g l s i n θ$
$W_{t} = - μ m g c o s θ . l$

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A block of mass m is released from top of incline plane of inclination. The coefficient of friction between the block and incline surface is μ(μ<tanθ). Find work done by normal reaction when block moves from top to the bottom.

The correct option is D ZeroWN=0∴FN⊥ΔSWg=mglsinθWt=−μmgcosθ.l

A block of mass m is released from top of incline plane of inclination. The coefficient of friction between the block and incline surface is $μ (μ < t a n θ)$ . Find work done by normal reaction when block moves from top to the bottom.

The correct option is D Zero
$W_{N} = 0 ∴ F_{N} ⊥ Δ S$
$W_{g} = m g l s i n θ$
$W_{t} = - μ m g c o s θ . l$