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Element1674

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## Homework Statement

A couch weighing 620N is to be pushed to a new location across the room. The coefficent of static friction between the couch and the floor is 0.31. What is the minimum force required to set the couch into motion.

## Homework Equations

See below

## The Attempt at a Solution

Given: F

_{g}=620N

μ

_{s}=0.31

Required: Force applied

Analysis: In order for the couch to begin moving, the applied force must be equal to the force of friction. Therefore finding the force of friction will indirectly find the minimum force applied.

Solution: Find the mass of the couch by using Fg=mg=620N

mg=620N

m=620N/9.81m/s^2

m=63.2...kg (keep all the decimals)

then find Ff using Ff=μFn; since there is no vertical acceleration, Fg=mg. The question gave mg (620N) so...

Ff=(0.31)(620N)

Ff=192N [backwards]

Fa=192N [forwards]

Therefore 192N of force are required.

Is this solution correct?