Answer:
523.32 N
Explanation:
Frictional Force: This is a type of contact 523.force that opposes motion between two surface in contact. It is measured in newton. Mathematically, frictional force can be expressed as,
F = μR............................. equation 1
Where F = frictional force, μ = coefficient of static friction, R = Normal reaction.
On a level surface, Normal reaction = Weight
Since the floor is a level surface,
R = W.............................. equation 2
Where W = weight of the refrigerator.
W = mg......................... equation 3
m = mass of the refrigerator, g = acceleration due to gravity
Where m = 89 kg, g = 9.8 m/s²
Substituting these values into equation 3,
R = W = 89 × 9.8 = 872.2 N
∴ R = 872.2 N, μ= 0.6
also substituting this values into equation 1
F = 872.2 × 0.6
F = 523.32 N
The minimum force needed to make the refrigerator to slid = The force required to overcome friction = Frictional force
∴The minimum force needed to make the refrigerator to slid = 523.32 N