Question

a block of mass 10 kg is held at rest against a rough horizontal wall coefficient of friction is equal to 0.5 under the action of force f the minimum value of f required for it is

Answer 1

as you know, whenever a body moves or tends to move over the surface of another body , then force comes into play which act parallel to the surface of contact and oppses the relative motion. the opposing force is called friction.

here body is held at rest against a rough horizontal wall of coefficient of friction is equal to 0.5.
so, friction ,f , 0 ≤ f < uN
e.g., 0 ≤ f < 0.5 × mg
0 ≤ f < 0.5 × 10 × 10
0 ≤ f < 50N

hence it is clear that minimum f = 0

Answer 2

Answer:it is not zero.

Explanation:

it's 400/2 root 3+1