A horizontal force of 10 N is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is 0.2. The weight of the block is :-

Question

A horizontal force of 10 N is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is 0.2. The weight of the block is :- (A) 10 N (B) 1 N (C) 2 N (D) 20 N

Tardigrade Admin · Accepted Answer

<img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/physics/bd14c6f576928efaa1e5b57411729b3e-.png" /> N =10 (In horizontal direction) ⇒ f = mg ( text but f =μ N ) ⇒ μ N = mg ⇒ (0.2)(10)= mg ⇒ mg =2 N

Q. A horizontal force of $10 N$ is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is $0.2$ . The weight of the block is :-

10 N

1 N

2 N

20 N

$N = 10$ (In horizontal direction)
$\Rightarrow f = m g (but f = μ N)$
$\Rightarrow μ N = m g$
$\Rightarrow (0.2) (10) = m g$
$\Rightarrow m g = 2 N$

Q. A horizontal force of 10N is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is 0.2. The weight of the block is :-

10 N

1 N

2 N

20 N

N=10 (In horizontal direction) ⇒f=mg( but f=μN) ⇒μN=mg ⇒(0.2)(10)=mg ⇒mg=2N

Q. A horizontal force of $10 N$ is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is $0.2$ . The weight of the block is :-

$N = 10$ (In horizontal direction)
$\Rightarrow f = m g (but f = μ N)$
$\Rightarrow μ N = m g$
$\Rightarrow (0.2) (10) = m g$
$\Rightarrow m g = 2 N$