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### 7.6 Example 6

A block of 5 kg is supported to a spring as show the image. If the spring constant is 500 N/m. Which is the stress in the string? How much the spring is stretched? Solution with FisicaLab

Erase the content of the chalkboard and select the SI system, and add one element Spring, one element Block, and one element Stationary reference system. Then add one element Force to the element Spring, and one element Force to the element Block, to make two free body diagrams as show the image below: The element Stationary reference system write to default the gravity value. To the element Block, write:

m

5

To the vertical force applied to the spring, that is an unknown data, write:

f

t

To the element Spring, the length stretched is an unknown data, write:

k

500

d

d

To the vertical force applied to the block, that is an unknown data and the same unknown data that to the other force, write:

f

t

Now click in the icon Solve to get the answer.

```t = 49.050 N ;  d = 0.098 m ;
Status = success.

```