materials Flashcards
what is the difference between laminar and turbulent flow
laminar flow only goes in one direction
turbulent flow constantly changes direction
what is the upthrust equal to
upthrust is equal to the weight of fluid displaced
equation for weight using pressure
weight = pressure x volume x gravity
why would an object experience upthrust underwater
- due to a higher concentration of particles moving the object to an area of low concentration
- the pressure below the object is greater, so the resultant force is upwards
what happens before an object reaches terminal velocity
- the velocity increases at a slower rate rue to the air resistance increasing
what is the volume of the object equal to in a fluid
the volume of an object is equal to the volume of a fluid
what are the steps to find the pressure applied to an object
- find the weight of the object, which is equal to the up thrust of the water
- find the mass of the object using w = mg
- find the volume of the object through the volume of water displaced, using the equation, u = pvg
- use the volume and mass to find the pressure using P = mv
how is an object with a parachute able to reach a lower terminal velocity
- the area of the object increases, which increases the air resistance
what is stokes law
D = 6π𝜂rv
drrag = 6pi x viscosity x radius x velocity
what happens during turbulent flow
- a vacuum is formed behind an object which increases drag
what will happen to the upthrust if the object is more dense
if the object is more dense, the upthrust is going to be greater and less displacement is required to match the upthrust
what is the purpose of the pimsoll line
the purpose of the pimsoll line is to communicate the density change in water based on the change in salt, and temperature
