College Physics

# Glossary

deformation
change in shape due to the application of force
drag force
$FDFD size 12{F rSub { size 8{D} } } {}$, found to be proportional to the square of the speed of the object; mathematically
$F D ∝ v 2 F D ∝ v 2 size 12{F rSub { size 8{D} } prop `v rSup { size 8{2} } } {}$
$FD=12Cρ Av2,FD=12Cρ Av2, size 12{F rSub { size 8{D} } = { {1} over {2} } Cρ ital "Av" rSup { size 8{2} } } {}$
where $CC size 12{C} {}$ is the drag coefficient, $AA size 12{A} {}$ is the area of the object facing the fluid, and $ρρ size 12{ρ} {}$ is the density of the fluid
friction
a force that opposes relative motion or attempts at motion between systems in contact
Hooke’s law
proportional relationship between the force $FF$ on a material and the deformation $ΔLΔL$ it causes, $F=kΔLF=kΔL size 12{F=kΔL} {}$
kinetic friction
a force that opposes the motion of two systems that are in contact and moving relative to one another
magnitude of kinetic friction
$fk=μkNfk=μkN size 12{f rSub { size 8{k} } =μ rSub { size 8{k} } N} {}$, where $μkμk size 12{μ rSub { size 8{K} } } {}$ is the coefficient of kinetic friction
magnitude of static friction
$fs≤μsNfs≤μsN size 12{f rSub { size 8{s} } <= μ rSub { size 8{s} } N} {}$, where $μsμs$ is the coefficient of static friction and $NN$ is the magnitude of the normal force
shear deformation
deformation perpendicular to the original length of an object
static friction
a force that opposes the motion of two systems that are in contact and are not moving relative to one another
Stokes’ law
$Fs=6πrηvFs=6πrηv size 12{F rSub { size 8{s} } =6πrηv} {}$, where $r r$ is the radius of the object, $η η$ is the viscosity of the fluid, and $v v$ is the object’s velocity
strain
ratio of change in length to original length
stress
ratio of force to area
tensile strength
the breaking stress that will cause permanent deformation or fraction of a material Do you know how you learn best?
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