- #1

Mathijsgri

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## Homework Statement

A box is on a 10 degree hill what is the force i have to pull to make the box move? and what force do i need to make the box move 20 meters

mass of the box: 12.000

Coefficient of friction: 0.08

speed 1 m/s

## Homework Equations

Ffriction= μ * Fnormal

F= m*a[/B]

## The Attempt at a Solution

Fnormal = Fgravtity* cos 80

Fn = (12,000* 10) * sin 80

Fn= 118177

Fn =118kN

**Ffriction= μ * Fnormal**

**Ffriction= 0.08* 118**

Ff= 9,45 kNFf= 9,45 kN

The total force to make the box move = 9,45 +120 * cos 80 = 30 kN

Is this correct?

F = m * a

I want to be at 1 m/s in 4s

F = 10.000 * 0,25

F= 2500N.

Do I have to pull 30kN to make the box move and then pull 2,5 kN or do i have to pull 32,5kN?

And when I achieve the 1 m/s what is the necessary force to make it a constante speed?

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