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

In summary, a 10 kg block is pulled horizontally with a force of 50 N and experiences friction of 30 N. The tension in the string is 50 N, as friction does not affect it. To account for the remaining 20 N, further calculations or information would be needed.
  • #1
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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  • #2
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?
 
Last edited by a moderator:

1. What is tension and how does it affect a string attached to a 10 kg block?

Tension is the force that is transmitted through a string when it is pulled tight. In the case of a 10 kg block, the tension in the string will be equal to the weight of the block (10 kg x 9.8 m/s^2 = 98 N) since the string is supporting the weight of the block.

2. How can the tension in the string be calculated?

The tension in the string can be calculated using the formula T = mg, where T is tension, m is the mass of the block, and g is the acceleration due to gravity (9.8 m/s^2).

3. What factors can affect the tension in the string?

The tension in the string can be affected by the weight of the block, the angle at which the string is pulled, and any external forces acting on the block or string.

4. How can the tension in the string be increased or decreased?

The tension in the string can be increased by increasing the weight of the block or by pulling the string at a steeper angle. It can be decreased by decreasing the weight of the block or pulling the string at a shallower angle.

5. What are some real-world applications of solving the tension in a string attached to a 10 kg block?

Understanding the tension in a string attached to a 10 kg block can be useful in engineering, construction, and physics. For example, it can be used to determine the strength of a rope needed to support a certain weight or to calculate the tension in cables of a suspension bridge.

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