Expand all + Hooke's Law 1R10.10 - Stretching a Spring 1R10.25 - Stretching a Horizontal Spring 1R10.30 - Springs in Series and Parallel + Tensile and Compressive Stress 1R20.10 - Breaking a Wire 1R20.20 - Bending Beam 1R20.22 - Flexible I-Beam + Shear Stress 1R30.30 - Spring Cube + Coefficient of Restitution 1R40.10 - Bouncing Balls 1R40.15 - Atomic Trampoline 1R40.30 -Dead and Live Balls + Crystal Structure 1R50.20 - Crystal Models 1R50.40 - Crystal Fault Model 1R50.45 - Crushing Salt