Solving the Tension in a String Attached to a 10 kg Block

AI Thread Summary
The problem involves a 10 kg block on a horizontal surface with a 50 N horizontal force applied via a string, while experiencing 30 N of friction. The tension in the string is initially thought to be 50 N, but friction plays a crucial role in determining the net force acting on the block. To find the actual tension, one must consider that the frictional force of 30 N must be overcome, leading to a total tension of 80 N in the string. The discussion highlights the importance of accounting for both the applied force and friction to accurately determine tension. Understanding these forces is essential for solving similar physics problems effectively.
JohnD623
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Homework Statement


A string is attached to a 10 kg block that lies on a horizontal surface. If the string is pulled horizontally with a force of 50 N, friction acting against it is 30 N. What is the tension in the string?

Homework Equations


F = ma

The Attempt at a Solution


Would it be 50 N? Friction wouldn't matter. Or does it matter? The answer is 80 N?
 
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Hi JohnD623! http://img96.imageshack.us/img96/5725/red5e5etimes5e5e45e5e25.gif
the string is pulled horizontally with a force of 50 N,
End of story!

The tension in the string is the force it carries, 50N.

To take this question further ...
30N overcomes friction, so how to account for the other 20N?
 
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