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25 Cards in this Set

  • Front
  • Back
Angular Velocity/Speed
*angular dispalcement/change in time
*SI Unit: rad/s or rev/s
Centripetal Acceleration
*center seeking acceleration
*rate of change of velocity/change in time
*V^2/r
*rω^2
When is there only centripetal accel., and no angular/tangential accel?
uniform circular motion
Centripetal Force
*net force that produces a centripetal acceleration
*friction/gravity/pushes//pulls from strings
Angular Acceleration

*time rate of change of angular velocity
*change ω/change time
*ω=ω(init) + αt
Newton's Law of Gravitation
*every particle attracts every other particle w/ force proportional to product of their masses and inversely proportional to square of distance between them
Tangential Velocity
*v
arc length/time
*v=s/t
*=rω
Torque

*tendency of a force to rotate an object
*same as force in translational motion
*nett torque changes rotational motion
*vector quantity
*τ= rF
*SI unit: m*N
Clockwise Torque
negative sign
Counter-Clockwise Torque
positive sign
Moment of Inertia
*I
*body's tendency to resist changes in its rotational motion
I=(sum) mr^2
*SI unit: kg*m^2
Conservation of Energy
Kinetic (roatational) + Kinetic(translational) + Potential= all 3 above but initial
Law of conservation of angular momentum for rotating body
w.o external/unbalanced torque, total angular momentum of a system is conserved
*Iω=I(ini)ω(ini)
angular impulse
change in angular momentum
Tensile Stress
elongating tension
<<< >>>>
Compression Stress
shortening tension
>>>> <<<<<
Stress vs. Strain graph
Tension>>>>> of axis crossing
Compression<<<<<of axis crossing
Hooke's Law
F= k * Δ L
* ΔL(change in length) is proportional to the magnitude F of the deforming force
Amount of elongation depends on
1. force applied
2. material object is made from
3. dimensions of object
What is directly proportional to Stress?
Strain (in elastic region)
Pressure
*p
* normal force perpendicular/area force is applied
*Pascal
Density

*ρ=m/v
*kg/m^3
gauge pressure
you must add atmospheric pressure to gauge pressure to get absolute pressure
When does an object float?
*ρf>ρo
When does an object sink?
ρf<ρo