Answer:
Step-by-step explanation:
Mass of sofa(m) = 105 kg
Force= 403 N
F = μ*N
Where:
F = friction force = 403 [N]
μ = static coefficient
N = Normal force [N]
The normal force of a body lying on a horizontal surface can be calculated by means of the product of mass by gravitational acceleration.
mass × acceleration due to gravity = 105 × 9.8 = 1029
403= μ *1029
substitute force with 403 N and resistance with 1029 × μ
403 = 1029 × μ
μ = 403/1029
= 0.391
Answer = 0.391