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why will an object with no force slow down and stop?
due to friction
what does friction act opposite to?
direction of movement
how do you travel at steady speed?
balance frictional forces
what is drag?
this is the resistance you get in a fluid
how do you reduce drag?
keeping the shape of an object streamlined, allows fluid to flow easily across it
how does objects in a fluid reach terminal velocity?
object sets off, force of gravity much more than frictional force slowing it down
accelerates
as speed increases friction builds up
reduces acceleration and eventually frictional force is equal
resultant force is zero
reached terminal velocity
what does the frictional force in terminal velocity depend on?
shape and area
In terms of a human skydiver, why would not having a parachute be bad?
has small area and force of w=mg pulling him down
why is it good to have the parachute open
more air resistance
still same force of W=mg pulling him down
terminal velocity decreases
safe speed for skydiver to hit ground at
