Calculate the maximum force required to accelerate the box

[charch]

Homework Statement

Calculate the maximum force required to accelerate the box from rest and not move the glass on it's surface on top of the box. I am given the mass of the box and glass, and both the static and kinetic coefficients of both objects. I have to create a spreadsheet that can accept any number that is inputted

Homework Equations

Ff=umg, fnet=Fg+Fn+Ff+Fa

The Attempt at a Solution

so far I've got the maximum force of static friction for the glass, using the equation F=umg... I am unsure how the box beneath it affects the force applied to the glass

 

[Spinnor]

The maximum force will give you the maximum acceleration, a. The required force must accelerate both masses with acceleration a and oppose the friction force on the box (don't forget the mass of the glass increases the friction force).

Hope this helps.

 

[SammyS]

Homework Statement

Calculate the maximum force required to accelerate the box from rest and not move the glass on it's surface on top of the box. I am given the mass of the box and glass, and both the static and kinetic coefficients of both objects. I have to create a spreadsheet that can accept any number that is inputted.

Homework Equations

Ff=umg, fnet=Fg+Fn+Ff+Fa

The Attempt at a Solution

so far I've got the maximum force of static friction for the glass, using the equation F=umg... I'm unsure how the box beneath it affects the force applied to the glass

Hello charch. Welcome to PF !

Draw two free body diagrams; one for the box, one for the glass.