The value of the friction force on the sofa will be 288 N.
The force which opposes the motion of the body is known as friction force.
Ralph wants to move a 60.0 kg sofa.
He applies a force of 480 N.
Under these conditions, the sofa initially moves with an acceleration of 3.20 m/s².
Then the value of the friction force on the sofa will be
We know
ΣF = ma
We have
m = 60 kg
a = 3.2 m/s²
Then the value of friction force will be
480 – f = 60 × 3.2
480 – f = 192
f = 480 – 192
f = 288 N
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