Richards said that China landing on the moon signals a new era of human expansion into space. I hope the U.S. and others return to the moon as a frontier of peaceful international exploration and economic development, he said.
Slip Rolls, Plate Rolls & Combination Machines. Slip rolls or plate rolls are designed to form sheet metal into curved panels or cylinders. These sheet metal rollers are available as manually operated or powered, and many include wire grooves for bending solid rod.
If the force applied to a wheel is less than the force of static friction, the wheel will grip the surface and begin to roll. If the force is more than that of static friction, the wheel will slip. Rolling friction is a force that slows the progress of a ball or wheel once it is already in motion.