D A v2 2m 2 2 mg 2mg so v this gives the terminal velocity vT DA DA Energy. 1 2 D A v 2 So the terminal speed is reached when the net force is zero (zero acceleration). Downwards vertical motion of a falling object. density of air ( A the area pushing against the fluid Eg. higher speeds (turbulent conditions) R where D drag coefficient (dimensionless), usually about 0 for spherical objects. This equation works for laminar flow and slow speeds. R b is a proportionality constant, while the negative sign represents the direction is in the opposite to that of the motion. forces depend on the speed of the object. Direction is always opposite to the direction of motion (relative to the medium). For motion through a fluid, the medium will exert a resistive force (drag), R on the object moving through the medium. ONLY if the object is on the verge of slipping this becomes F s friction acts when the object is motion Fk Resistive forces. friction acts to keep the object from moving, Fs ( n is the normal force). Friction is a force that always opposes the direction of motion and is parallel to the surfaces in contact.
#Physics 101 mechanics pdf free
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