What is the net force on the block immediately after it starts to slide?

AI Thread Summary
The problem involves a block with a mass of 5.0 kg resting on a horizontal surface, where the coefficient of static friction is 0.40 and the coefficient of kinetic friction is 0.15. The applied horizontal force increases until it equals the static friction force, which is calculated using the formula: static friction force = coefficient of static friction × normal force. Once the block begins to slide, the net force acting on it is determined by the difference between the applied force and the kinetic friction force. The discussion highlights confusion regarding how to calculate the static friction force and the net force after sliding begins.
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Homework Statement



The coefficient of static friction between a block and a horizontal floor is 0.40, while the coefficient of kinetic friction is 0.15. The mass of the block is 5.0 kg. A horizontal force is applied to the block and slowly increased. What is the value of the applied horizontal force at the instant that the block starts to slide?

What is the net force on the block immediately after it starts to slide?


Homework Equations





The Attempt at a Solution



I am absolutely stumped by this problem! After a FBD i don't really know where to start, Please some one help me!
 
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The instant the block starts to slide the applied force will be equal to the static friction force. How do you work out the static friction force?
 

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