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Problems with Pseudo Force

What is value...

Question

What is value of static friction force on the block ?

A

μ_{s} N

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B

μ_{k} N

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C

0

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D

Cant say

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Solution

The correct option is C 0
In horizontal direction as acceleration is zero.
Therefore $\sum$ F = 0.
$∴ f = 0$

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Similar questions

Q. Assertion :Static friction is as self-adjusting force upto its limit

μ_{s} N

μ_{s}

is the coefficient of static friction. Reason: One can use the equation

f_{s} = μ N

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Q. Multiple correct answers type
Mark the correct statement(s) regarding friction.
a. Friction force can be zero, even though the contact surface is rough.
b. Even though there is no relative motion between surfaces, frictional force may exist between them.
c. The expressions

f_{L} = μ_{s} N

f_{k} = μ_{k} N

are approximate expressions.
d. The expression

f_{L} = μ_{s} N

tells that the directions of

f_{L}

and N are the same.

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μ

.
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