Calculate the maximum force required to accelerate the box

  • Thread starter charch
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  • #1
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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 ive got the maximum force of static friction for the glass, using the equation F=umg... Im unsure how the box beneath it affects the force applied to the glass
 
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Answers and Replies

  • #2
Spinnor
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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.
 
  • #3
SammyS
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Homework Helper
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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.
 

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