Question

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​

Answer 1

Answer:

Weight of the block(W) is balanced by the frictional force due to the wall

W = f...... (1)

f = μN........(2)

Where 'μ' is coefficient of friction and 'N' is normal force

Using (1) & (2)…we get

W = μN = 0.2*10N = 2N

W = 2N (weight of the block)

Answer 2

Answer:

2 N

Explanation:

Frictional force balances the weight of the block.

$F_{f}$ = μN

⇒ $F_{f}$ = (0.2)(10) = 2 N

As the block is in equilibrium, (As it is stationary) The weight of the block must cancel out the frictional force,

According to Newton's second law, $F_{net}$ = ma

⇒ W - $F_{f}$ = m(0)

⇒ W = $F_{f}$

Hence weight of the block is 2 N.

Thanks !