Practice Question: Bending Moment Sign for Concave Upward Beam

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Solution

When a beam bends like a smiley face, with the middle curving up, it means the top part is getting squished (like pushing something together) while the bottom part is getting stretched (like pulling something apart). This happens when there's a force that tries to make the beam bend. This kind of bending is called positive bending and it's like when you try to bend a stick upwards from the middle.

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