Friction, static

Dry nitrocellulose, which bums rapidly and furiously, may detonate if present in large quantities or if confined. Nitrocellulose is a dangerous material to handle in the dry state because of sensitivity to friction, static electricity, impact, and heat. Nitrocellulose is always shipped wet with water or alcohol. The higher the nitrogen content the more sensitive it tends to be. Even nitrocellulose having 40% water detonates if confined and sufftcientiy activated. AH large-scale processes use nitric—sulfuric acid mixtures for nitration (127—132). [Pg.14]

Static friction is the force which must be overcome in order to start the motion of a body over a surface. Kinetic friction is the force which must be continuously overcome in order to maintain uniform motion of the body over the surface. The coefficient of friction (static or kinetic respectively) is the frictional force divided by the perpendicular or normal force between the surfaces in contact. [Pg.18]

Friction, static — Resistance to initial motion between two surfaces. [Pg.169]

As demonstrated by the foregoing two formulations, some problems taken from mechanics can be formulated by using only Newton s laws of motion these are called mechanically determined problems. The dynamics of rigid bodies in the absence of friction, statically determined problems of rigid bodies, and mechanics of ideal fluids provide examples of this class. Some other mechanics problems, however, require knowledge beyond Newton s laws of motion. These are called mechanically undetermined problems. The dynamics of rigid bodies with friction and the mechanics of deformable bodies provide examples of this class. [Pg.2]

Section 22.6 has accounted for one important nonlinearity, namely the velocity limit of the valve. Another nonlinearity that can cause control problems is static friction, sometimes referred to as stiction, although more properly known as Coulomb friction. Static friction acts to prevent or impede relative motion by opposing the force applied. Its effect on valve movement may be measured as the difference between the valve s demanded travel (equal to the normalized controller output) and the actual valve travel seen on the plant. This difference will lie normally in the normalized range 0.001 to 0.005 (0.1 to 0.5% of total valve travel) for valves fitted with a valve positioning system, although the author has had experience of an important control valve with a value measured at... [Pg.290]

Coefficient of Friction, static (film/film) 0.63 ASTM D1894... [Pg.81]

Static Coefficient of Friction The ratio of the force that is required to start the friction motion of one surface against another to the force, usually gravitational, acting perpendicular to the two surfaces in contact. Also called Coefficient of Friction, Static. [Pg.210]

Antiblock and Concentration Reblocking Force (g) Coefficient of Friction (Static/Dynamic) Haze (%) Clarity (%) Gloss (%) ... [Pg.189]

A less common version of this process is friction static spray, where the electrostatic charge is produced by friction between powder particles and the spray gnn itself. [Pg.199]

Coefficient of friction, static (initial), kinetic (in motion)... [Pg.36]

Coefficient of Friction, Static See Static Coefficient of Friction. [Pg.151]

PTFE has excellent properties, including chemical inertness, heat resistance (at both high and low temperatures), electrical insulation, and low coefficient of friction (static 0.08 and dynamic 0.01), and it is nonstick over a wide temperature range (-260°C to... [Pg.63]

Property Taber Abrasion (mg/1000 Cycles) Coefficient of Friction, Dynamic Coefficient of Friction, Static... [Pg.152]

Pressure (MPa) Sliding Velocity (m/min) PV(MPa m/min) Test Method Coefficient of Friction, Static Coefficient of Friction, Kinetic Wear Factor, K [10 mmV (N m)] Wear Factor, K, Mating Surface [10 mmV(N m)]... [Pg.235]

Coefficient of friction—static versus steei ASTM D1894 (23°C) 0.23 0.22 0.20 0.18 0.49... [Pg.313]

Uses Lubricant for size press or calender stack applies. corrosion Inhibitor for steel rolls prevents sticking, picking, and blocking of surf, sizing formulations release agent for Yankee dryers reduces coeff. of friction (static and dynamic) on all paper and board component of paper/paperboard In contact with dry foods defoamer In food-contact paper/paperboard Features Forms stable emulsions compat. with all types of starch for use at neutral to alkaline pH at temps, below 165 F... [Pg.1715]

It is also important to point out the distinction between static friction and kinetic friction. Static friction is the force that must be overcome to begin sliding. Static friction force is equal and opposite to the applied loading force up to a maximum static friction force, and no acceleration or movement occurs below the maximum force. According to the Amontons law, static frictional force is proportional to the normal force pushing the two surfaces together ... [Pg.382]

Case Number Correlations Liquid Drop Time (h) Pressure Drop (kPa) Frictional Static Total ... [Pg.189]

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