Calculating Frictional Force in a Sliding Box Experiment

AI Thread Summary
The discussion revolves around calculating the frictional force acting on a sliding box. A girl applies a horizontal force of 2 Newtons to a 10-Newton box, which moves at a constant speed of 3 m/s. Since the box maintains a constant velocity, the net force is zero, indicating that the frictional force must also be 2 Newtons. This balance of forces explains why the box continues to slide without acceleration. The key takeaway is that when the applied force equals the frictional force, the object moves at a uniform velocity.
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A small girl applies a horizontal force of 2 Newtons to a 10-Newton box which slides
across the floor with a constant speed of 3 m/s. What is the frictional force, in Newtons,
by the floor on the box?


F=ma


The correct answer is 2 but I don't understand why. If the horizontal force is 2 and the frictional force is 2, wouldn't the box not slide? Indicating that the velocity is constant means that there is no acceleration correct?
 
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If the frictional is the maximum force which is needed to start the motion. If the applied force is just equal to the frictional force, the body will move with uniform velocity.
 
oh! thank you!
 
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