Let's look at a wire holding a heavy weight. Step 1: Attach a 5kg weight to a long steel wire hanging from the ceiling. Step 2: The weight pulls the wire downwards (Force = 5kg * 9.8 m/s² = 49 Newtons). Step 3: Because the wire is being pulled to become longer, this is Longitudinal (Tensile) Stress. Step 4: If the wire has a cross-section area of 0.0001 square meters, we calculate stress by dividing Force by Area (49 / 0.0001 = 490,000 Pascals). The wire develops an internal force of 490,000 Pascals to stop itself from snapping.