# What is the acceleration of a crate after it has just started to move?

## Homework Statement

The coefficients of static and kinetic friction between a 445 N crate and the warehouse floor are 0.565 and 0.450, respectively. A worker gradually increases his horizontal push against this crate until it just begins to move and from then on maintains that same maximum push.

## Homework Equations

What is the acceleration of a crate after it has just started to move?

## The Attempt at a Solution

I tried to multiply the kinectic friction coefficient by the Normal Force to get kinetic friction. Then I tried to divide Kinectic Friction by the mass of the box and I got:

4.39 m/s2 but it was wrong.

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## Homework Statement

The coefficients of static and kinetic friction between a 445 N crate and the warehouse floor are 0.565 and 0.450, respectively. A worker gradually increases his horizontal push against this crate until it just begins to move and from then on maintains that same maximum push.

## Homework Equations

What is the acceleration of a crate after it has just started to move?

## The Attempt at a Solution

I tried to multiply the kinectic friction coefficient by the Normal Force to get kinetic friction. Then I tried to divide Kinectic Friction by the mass of the box and I got:

4.39 m/s2 but it was wrong.
The force needed to start moving the box is F_static= mu_static * Normal
Once the box starts moving the force of kinetic friction is F_kinetic=mu_kinetic *normal

The net force at that point is F_net=F_static-F-kinetic
a = F_net/mass_crate

The force needed to start moving the box is F_static= mu_static * Normal
Once the box starts moving the force of kinetic friction is F_kinetic=mu_kinetic *normal

The net force at that point is F_net=F_static-F-kinetic
a = F_net/mass_crate
Thanks!