Investigation- Air Resistance

Investigation- Air Resistance - by t aking t he slope of t...

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Investigation: Air Resistance of Falling Coffee Filter Introduction Air resistance is the force that opposes the relative motion of an object through a fluid – liquid or gas. Air resistance is in the opposite direction to the velocity of the object and is dependent of the velocity. The air resistance diminishes the net forces for an object. Air resistance is also referred to as the drag force and has it has already been experimentally determined that the drag force is sometimes proportional to the terminal velocity or sometimes proportional to the terminal velocity squared: = - Fdrag bvT = - Fdrag cvT2 Both constants b and c are drag coefficients that depend on the size of the object. When the air resistance of an object equals the weight of the object, the net force is zero and no further acceleration occurs. When the acceleration terminates and the object falls at a constant velocity the object has reached its terminal velocity . A free-falling object achieves its terminal velocity when the force of gravity ( Fg ) is equal to the drag force ( ) Fdrag which causes the overall net force to equal zero. In the case of free-falling objects the force of gravity is the main force acting on the object. In addition, to the force of gravity there is an opposite force caused by air resistance which eventually equals the force of gravity during the objects free-fall. From this we can deduce that at terminal velocity the drag force acting on the object is equivalent to the magnitude of the gravitational force on the object, = Fdrag Fg Hence we will be applying Newton`s second Law to analyze the motion of object under the influence of gravity and under the dual influence of gravity and air resistance.In this investigation we will be determining which of the functions best models the drag force of coffee filters by calculating the air resistance for a coffee filter falling from a fixed. Objectives
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This note was uploaded on 04/11/2010 for the course ENG 1p03 taught by Professor Dr.fleisig during the Spring '10 term at McMaster University.

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Investigation- Air Resistance - by t aking t he slope of t...

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