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## Homework Statement

A heavy box (200.0 kg) is sitting still on a warehouse floor, despite the efforts of a worker to push it (with a force of 300.0 N). If the coefficient of static friction between the box and the floor is 0.6, what is the friction force between the box and the floor? What is the frictional force between the box and the floor if another worker puts another box (also 200.0 kg) on top of the first box while the first worker continues to pull with 300.0 N?

## Homework Equations

Not sure

## The Attempt at a Solution

ok, so this problem deals with static friction. What is the equation for the friction force? I am assuming for the first part of the problem, you plug in the force and mass. Also, If you simply double the the weight in kg, doesnt the force quadruple?