It depends. Generally, sizes up to 120mm are solid, and those from 140mm up are hollow.
Small balls made of styrofoam. Craft stores sell them in various sizes.
The property that separates styrofoam balls is their buoyancy. Styrofoam balls are lightweight and have air trapped inside, making them less dense than water. This causes them to float on the surface of water, separating them from denser materials that sink.
Most balls are indeed hollow; they have air pressure inside. However, there are balls that don't have air. Those ones are not hollow.
You can get Styrofoam balls from any craft store. Check Michaels craft store.
No
no its not hollow
No it does not
No, because the Styrofoam is to light and won't produce enough kinetic energy. Plus Styrofoam is not a good material for Newton's cradle.
Styrofoam balls (including larger-sized ones) can be found in stores that sell craft supplies, including:WalmartMichaels Arts & CraftsDollarama and other dollar storesDeserres
They are hollow rubber balls. Hope this helps!
styrofoam balls paint sticks
Hopefully, i need one too