RoughSalad
RoughSalad t1_jdliqy0 wrote
Reply to If earth was a smooth sphere, which direction would water flow when placed on the surface? by Axial-Precession
Towards and away from the moon, like on the bumpy sphere.
RoughSalad t1_j5e59ha wrote
Reply to Photo bombed by a plane. by DBWallz
"Attack ships on fire off the shoulder of Orion ..."
RoughSalad t1_it37t9b wrote
A perfectly round wheel won't roll frictionless/forever - unless you find an infinitely stiff surface to roll on, that is. A single point/line of contact will create infinite pressure, the wheel will sink in until the surface can support the weight. Along the area of contact we now have forces of adhesion, and moving the depression to roll forward will take up energy as well.
RoughSalad t1_je9k064 wrote
Reply to comment by Durrynda in Do planets of solar system have parallel orbits? by Durrynda
If you spin a ball of pizza dough it flattens into a plane.