VC.10 Surface Area Calculations and Surface Integrals (Day 2)

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Presentation transcript:

VC.10 Surface Area Calculations and Surface Integrals (Day 2)

Example 1: Surface Area

The Surface Area Conversion Factor

A longer normal vector means that the uv-rectangle has much more surface area in xyz-space (more curvature, really)

The Surface Area Conversion Factor

Example 1 Revisited: Surface Area

Example 2: Surface Integrals

Summary: Surface Integrals:

Example 3: Surface Area Enclosed in a Curve Plotted on a Surface (Bonus Material!)

Today’s Material Did Not Reference Vector Fields Acting on a Surface! Let R be a solid in three dimensions with boundary surface (skin) C with no singularities on the interior region R of C. Then the net flow of the vector field Field(x,y,z) ACROSS the closed surface is measured by:

Today’s Material Did Not Reference Vector Fields Acting on a Surface! The Divergence Theorem is great for a closed surface, but it is not useful at all when your surface does not fully enclose a solid region. In this situation, we will need to compute a surface integral. For a parameterized surface, this is pretty straightforward: