Materials P2 Flashcards
What are the base si quantities / units?
- length - m
- mass - kg
- time - s
- current - A
- temperature - K
- amount of substance - mol
- luminous intensity - cd
what is the definition of a fluid
a fluid is a liquid or gas, both flow
what is the equation for the surface area of a sphere
4 pi r^2
what is the equation for sphere volume
4/3 pi r^3
what does archimedes principle state
when a body is partially or totally submerged in a fluid, the upthrust force is equal to the weight of the fluid it has displaced.
what is the description that fits laminar flow of a liquid
when the streamlines flow together in a smooth motion without their paths crossing
what is the description that fits turbulent flow of a liquid
when the streamlines collide and swirl around one another
how is the drag found at terminal velocity when the values known are weight, upthrust and the object is moving downwards
the force of drag is weight - upthrust if the object is moving downwards
how is the drag found at terminal velocity when the values known are weight, upthrust and the object is moving upwards
the force of drag is upthrust - weight if the object is moving upwards
what is the definition of stress
the internal force acting on an object
what conditions does stokes law can be applied to
- small sphere
- constant temperature
- low velocity
what is the limit of proportionality
the point at which the relationship between force and extension / stress and strain is no longer proportional
what is the elastic limit
the point at which an object no longer returns back to its original shape
what is the yield point
the point after which no additional force is needed to cause additional extension
what is elastic deformation
where an objects changes shape but can revert back to its original shape
