Frontiers of friction. 

 - A Shell Film,, 
 - Videocassette (VHS)(21 min.) : sd., col. 1/2 in. 
<br/><br/> Friction has been known a long time, how to use it, how to reduce it, too little friction, too much or just the right amount.  Friction is the resistance a body meets in moving over another.  In the right conditions friction can produce enough heat to weld two bodies together so friction can be useful. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Friction gearing.<br/>Friction materials.