# User:Guy vandegrift/sandbox/Trash

### Group Lab physics 2400 Thursday 15 March 2018 (UTC)

The entire class created this lab by dictating to the prof. The experiment did not work well, since students reported that there was a tendency to be disengaged with so many "cooks" making the stew.--Guy vandegrift (discusscontribs) 23:31, 21 March 2018 (UTC)

#### We solved two statics problems

The first problem (See Fig. 1) involves a 100N beam suspended by two ropes with one weight at each end. The length was L, which we set WLOG equal to one metre.

The second problem cionsist of 100N beam one end attached to wall, susmpended by a string connecting the beeam to the wall. The beam was attched to the wall by a frictionless hinge. The wall exerted a reaction force on the hinge (the reaction force had x and y components). In additions to the 100N weight of the beam (which was assumed exerted at the center of the beam), there was an additional weight 750N attached via rope at the end of the beam.

#### Results

The first problem went well. We found two equations. One was trivial in that only one variable was involved, which permitted subsitution for the other.

The second problem didn't go so well. The groups go contradictory answers. We used the hinge as the axis, so the torque equation was fine. But the sum of all forces in the y direction included (1) the attached weight, (2) the weight of the beam, and one component of the tension. But we forgot the reaction force, which was by the wall on the hinge.

pc120161220T142035

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