Wooden Frame Abacus, 6 Steel Wires Chemistry_Molecular Model Sets demonstrating mechanical advantage as the

demonstrating mechanical advantage as the angle of incline changes the effort needed to roll the cart up the slope

and airway anatomy at scale

this handle-fitted bicycle wheel lets students feel torque resistance in a spinning mass

this regulated low-voltage DC power pack outputs a fixed +12V through front-panel terminals on the benchtop

Hinged V-section arms grip lenses and mirrors up to 75mm in diameter

Wooden Frame Abacus, 6 Steel Wires Chemistry_Molecular Model Sets demonstrating mechanical advantage as theWooden frame abacus on a 13. 5 by 9. 5 inch finished base, six steel wires carrying 20 beads each for hands on instruction in counting, place value, and basic arithmetic.