Drilled Aluminum Pendulum Ball, 25mm Subcategory_Power Supplies 25-inch Atwood machine with two

25-inch Atwood machine with two 2-inch blue-plastic pulleys on an aluminum rod

letting students explore mechanical advantage by counting the supporting strands and measuring effort

Used to read the microampere-scale currents found in photodiode and transistor-bias circuits

Five-pack of 3/4-inch steel marbles

5 inch specific gravity cylinder with a top hook for density and specific-heat work

Drilled Aluminum Pendulum Ball, 25mm Subcategory_Power Supplies 25-inch Atwood machine with twoAt a full inch diameter, the drilled aluminum ball gives a lightweight contrast to steel and brass balls of the same size in pendulum period and momentum transfer demonstrations.