Force k o kkn when there is no relative motion and a

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Unformatted text preview: Friction • • • • Whenever two bodies interact by direct contact of their surfaces, we describe the interaction in terms of contact forces The component vector parallel to the surface is the friction force denoted by ƒ The kind of friction that occurs when a body slides over a surface is called the kinetic friction force ƒk o ƒk=µkn When there is no relative motion, and a body exerts an equal and opposite friction force on another body it is called the static friction force ƒs o Ƒs≤µsn o This is a relationship between magnitudes, not a vector relationship o The equality sign holds only when the applied force T has reached the critical value at which motion is about to start • Fluid resistance is the force that a fluid (gas or liquid) exerts on a body moving through it o The direction of the fluid resistance force acting on a body is always opposite the direction of the body’s velocity relative to the fluid and the magnitude of the force usually increases with the speed of the body though the fluid o At low speed ƒ=kv Physics 1001 Notes • o At hig...
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This note was uploaded on 04/09/2014 for the course PHYS 1001 taught by Professor Helenjohnston during the Three '13 term at University of Sydney.

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