Simple Machines Screw Model Foodsafe Replacement drive belt matched to

Replacement drive belt matched to the companion hand-crank Van de Graaff generator

and strings for equilibrium and vector experiments

Free-standing plant cell model displays greatly magnified organelle detail for student-directed rotation and inspection in cell biology coursework

this Brownlee-pattern apparatus gives a clean visual proof of the 2:1 stoichiometry of water decomposition

this 6V-maximum electromagnet supports paper-clip-load measurements that reveal the linear relationship between input voltage and lifting force

Simple Machines Screw Model Foodsafe Replacement drive belt matched toSquare topped wooden screw simple machine model with a leverage block, letting students measure rotational distance against linear advance to derive the mechanical advantage of the spiral.