Hello all,(adsbygoogle = window.adsbygoogle || []).push({});

I'm having some difficulty understanding the relationship between the diagrams. I understand that the area under the shear force diagram curve is equal to the moment. But let's say you have a cantilever beam, 10 m long, anchored on the left. There is an evenly distributed load over the whole beam and a downward force at the end of the beam (at x=10m).

1. If a beam is anchored (in this case, on the left side) does the shear force diagram start above zero at whatever the magnitude of the shear force is? Is that just the reaction force? My professor mentioned I didn't need to find the reaction force but I didn't quite understand what he meant.

2. Since there is a force at the end of the beam (at 10 m), that means on the shear diagram it will be a straight line down to zero. So for the moment diagram, I calculate the area under the curve of the shear force diagram, and that is the maximum moment (in this example)?

3. Does the moment diagram go to zero because the shear force diagram goes to zero after x=10?

Also I hope this is the right place for this, I am new and am unsure if this is the correct forum.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Shear Force and Bending Moment Diagrams

**Physics Forums | Science Articles, Homework Help, Discussion**