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
1) 20 N
2) 50 N
3) 100 N
4) 2 N
​

Answer 1

Answer:

Weight = 2 N

Explanation:

Normal force = 10 N

frictional force = uN

= 0.2 × 10

frictional force = mg

0.2 × 10 = m × 10

m = 0.2 kg

F = mg

= 0.2 × 10

= 2 N

Answer 2

Answer:

See diagram

friction must balance weight

so

$f = \mu \: N = mg = W\\ W= \mu \: N = 0.2 \times 10 = 2N$