air resistance: coffee filterssrjcstaff.santarosa.edu/~lwillia2/40/dragforce.pdf · drag force is...
TRANSCRIPT
Air Resistance: Coffee Filters● Drag Force● Terminal velocity● Derivation for lab ● Sample Data ● Pre-lab ● Results: correlation coefficient ● Please read 6.4 prior to completing pre-lab
Drag force is the resistance force caused by the motion on an object through a medium (water, air, oil)
The power of velocity depends on the fluid
(For lab: What is the best relationship?)
C= Drag coefficient (dependent on object)ρ= Density of the fluidA= Area of object facing fluidv= Instantaneous velocity of the object
Drag Force
Terminal VelocityWhen air resistance balances the weight, the objects stops accelerating and falls with constant velocity called terminal velocity
The heavier object requires greater air resistance to balance its weight and therefore more speed so the heavier object accelerates
longer and has a greater speed and greater terminal velocity.
Terminal Velocity: Mass
Lab: Determining air resistance with coffee filtersThe goal is to determine what power of terminal velocity is a proportional to the drag force.
How will you calculate drag force?
Which relationship is better? Is this always the case?
Taylor’s graphs please don’t copy Taylor’s graphs please don’t copy
R-squared
● Statistical measure of fit that indicates how much variation of a dependent variable is explained by the independent variable in a regression model
● R-squared values close to 1 indicate a good fit