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Drilled Physics Ball SetThese 1" (25mm) drilled physics balls are great for doing Newtonian physics experiments such as collisions or for use in mass/volume experiments. A 3mm hole has been exactly drilled in the center of each sphere in such a way as to allow for the recessing of a knot. This allows the set to also be used as pendulums. These crafted balls come in pairs which makes them ideal for comparing how different materials affect your experiment. Set of 14 drilled balls contains 2 each of Steel, Brass, Aluminum, Lead, Copper, Zinc and Wood. Balls come packaged in plastic case.
Assorted Physics Ball SetThese high quality assorted physics balls are great for doing Newtonian physics experiments such as collisions and pendulums or for use in mass/volume experiments. This set contains every type of sphere that you could need all conveniently packed in a nice plastic case that includes a foam bottom which holds each ball securely in place to insure that this set will stay in great condition.
For starters you will find 1 each of the popular 1" (25mm) drilled balls made of steel, copper, lead, aluminum, brass and wood which have a 3mm hole exactly drilled in the center so that a knot can be recessed. Next add the always handy 1" (25mm) solid steel ball and a second 1" (25mm) solid steel ball that has bifilar suspension lugs. Not to forget the hooked spheres, this set contains 1 each of brass, lead and steel in a 1.5" (38mm) hooked version. Lastly we have added a 1.5" (38mm) solid cork ball.
This set is a terrific value. You get everything that you can do with a density block set combined with the much greater versatility of a quality sphere set all in one!