For example, a copper pin sliding against a thick copper plate can have a COF that varies from 0.6 at low speeds (metal sliding against metal) to below 0.2 at high speeds when the copper surface begins to melt due to frictional heating. Source: Internet
For example, silicone rubber or acrylic rubber -coated surfaces have a coefficient of friction that can be substantially larger than 1. While it is often stated that the COF is a "material property," it is better categorized as a "system property." Source: Internet
From 2007–2012, Ms. Tomlin held several senior leadership positions, including vice president of marketing, with Capital One Financial Corp. (NYSE: COF), where she headed commercial banking, retail marketing and sponsorships. Source: Internet
The latter speed, of course, does not determine the COF uniquely; if the pin diameter is increased so that the frictional heating is removed rapidly, the temperature drops, the pin remains solid and the COF rises to that of a 'low speed' test. Source: Internet