Yes, the moment is negative internally as it causes tension on the top and compression on the bottom. Since it's drawn that way in the FBD, the sign when solved is +, showing the assumed direction (negative moment) is correct. This is definitely a confusing topic. It's the difference between the FBD sign convention versus internal moment sign convention. Does that help?
Thank you for your presentation.
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Thanks! I hope the information helps :)
The moment caused by the force of 30 N is negative.
Yes, the moment is negative internally as it causes tension on the top and compression on the bottom. Since it's drawn that way in the FBD, the sign when solved is +, showing the assumed direction (negative moment) is correct. This is definitely a confusing topic. It's the difference between the FBD sign convention versus internal moment sign convention. Does that help?