In one case, the opposite arc cracks were generated all over the two sides of the rolling track, and this could not be explained by simplified kinematics model.
The second mechanism results from the contact angle asymmetry on the advancing and receding sides of the rolling particle, which leads to a net torque on the particle arising from the tangential component of the surface tension force.
One side-effect of the rolling blackouts that afflicted Cape Town and Johannesburg was that they disabled the electric fences, spotlights and alarms that adorn richer people's houses, making them easy pickings for thieves.
Georgetown plays its home games at a site known simply as Multi-Sport Field, carved out of the rolling slope on the south side of campus.
According to historian Alwyn Barr, "trees shaded both sides of the broad riverbottom which lay about six feet below the level of the rolling praire nearby".
4.09pm BST On the par-three 13th, Jimenez sets his tee shot out to the right, the ball bouncing off the bank and rolling past the pin, catching the slope on the other side of the green, then rolling wall-of-death style round and back towards the pin, ten feet from the flag.
Somewhat unexpectedly, they flirt with the 1980s in a couple of places: "The Immortals" has a Flock of Seagulls/Duran Duran guitar interlude, while the rolling bassline of "Beach Side" is reminiscent of the Cure or New Order.
It went high off the left side of the back rim, rolling away as time expired.
Scott presses a button that sends one side of it rolling upwards, like a tiny garage door of doom.
