Background Football turf is increasingly used in European soccer competition. Little is known on the rotational torque that players experience on these fields. High rotational torques between the shoe ...

A VERTICAL needle of iron suspended in vacuo by the co-axial field of a solenoid theoretically may have infinitesimal frictional torque against axial rotation. The purpose of the present note is to ...

Everyone loves perpetual motion machines. They are a representation of the highest level of creativity in finding loopholes in the laws of physics. Let's take a look at this one. What is a perpetual ...

The LP Survivor Series of disc-pack couplings from R+W America, Bensenville, Ill. (www.rw-america.com), transmit torque using friction. A series of bushings press the disc pack together. Precise ...

Torque limiting couplings allow a user to protect mechanical equipment, or its work, from damage from mechanical overload. These torque limiters are designed for machines with chain, gear or belt ...