Mass-volume relationship for uniform material

Steps:

• Recognize that samples are the same type of wood, so density is constant.
• Use formula: mass = density × volume, indicating direct proportionality.
• Plot mass (y-axis) versus volume (x-axis) for a straight line through origin.
• Select graph matching this linear trend.

Why B is correct:

• It displays a straight line through the origin, matching mass = ρV where ρ (density) is constant.

Why the others are wrong:

• A shows a curve, implying varying density.
• C shows a horizontal line, suggesting constant mass regardless of volume.
• D shows a line not through origin, implying non-zero mass at zero volume.

Final answer: B