9.7 Example 7

What is the maximum force F that can be applied without tipping the piece? (The mass of the piece is 3.5 kg and the mass center point is indicated by the 18 cm).

Solution with FisicaLab

Select the group Static and, inside this, the module Static of solids. Erase the content of the chalkboard and select the SI system. And add one element Stationary reference system, one element Solid, two elements of solid and the necessary elements Force, as show the image below:

The Stationary reference system set the gravity value to default. Now to the element Solid, that we call Piece, we have:

Name

Piece

m

3.5

xc

18 @ cm

yc

0

ang

0

To the element of solid that represent the corner where is applied the force F, we have:

Name

Piece

x

50 @ cm

y

0

And to the applied force here, that is an unknown data:

f

F

The other element of solid represent the lower right corner, because when the tipping is imminent, the normal force is applied here. Therefore, we have:

Name

Piece

x

25 @ cm

y

0

And to the applied force, that represent the normal force and that is an unknown data:

f

N

Now click in the icon Solve to get the answer:

N = 43.949 N ;  F = 9.614 N ;
Status = success.