Beryl is interning at a plastic manufacturing factory and is asked to help design a new plastic shopping bag that can carry heavy loads while being light and inexpensive. To test the strength of a proposed material, Beryl outlines an experiment using Young's Modulus to measure how the material stretches under different weights by creating strips of the plastic, attaching weights, and measuring the extension. The results would be plotted on a stress-strain graph to determine the material's Young's Modulus and suitability for plastic shopping bags.

1. Research on Plas tic shopping bags By Grace, A2 1

9. Stress/ Pa Strain Cross-sectional area/m 2 Weight/N Thickness of cross section/m Extension of the strip/m Mass of the loads/kg