# Shared Flashcard Set

## Details

Formulas
Physics B Formulas
50
Physics
04/13/2011

Term
 Components of a Vector
Definition
 Vx=vcosθ Vy=vsinθ     V=√Vx2+Vy2     θ=tan-1(Vy/Vx)
Term
 Average Speed
Definition
 Distance Time
Term
 Average Velocity
Definition
 Displacement Time Δx Δt m/s
Term
 Average Acceleration
Definition
 Average Velocity Time Δv Δt m2/s
Term
 Variables in Kinematic Equations
Definition
 v0 (initial velocity) vi (final velocity) Δx (displacement) a (acceleration) t (time interval)
Term
 Position as a Function of Time
Definition
 x=x0+v0t+.5at2 m
Term
 Velocity as a Function of Position
Definition
 v2=v02+2a(x-x0) m/s
Term
 Velocity as a Function of Time
Definition
 v=v0+at m/s
Term
 Tension in Two Ropes
Definition
 [image] [image] Fnet,x=T1(cosθ1)-T2(cosθ2) Fnet,y=T1(sinθ1)+T2(sinθ2)-mg
Term
 Force of Friction
Definition
 Ff=μFN N=Newtons
Term
 Friction Application
Definition
 [image] Fnet,x=FNμ-Fp(cosθ) Fnet,y=FN+Fp(sinθ)-mg
Term
 Inclined Planes
Definition
 [image] Fnet,x=FN-mg(cosθ) Fnet,y=FNμ-mg(sinθ)
Term
 Torque
Definition
 T=Fd Tnet=counterclockwise-clockwise N=Newtons
Term
 Newton's Second Law
Definition
 Fnet=ma
Term
 Fnet for a Pulley
Definition
 [image] [image]   a=-mg                                       a=g(M-m)            m+M                                             M+m
Term
 Momentum
Definition
 p=mv kg•m/s or N•s
Term
 Impulse
Definition
 J=FΔt=Δp kg•m/s or N•s
Term
 Conservation of Momentun
Definition
 p1,0+p2,0=p1,f+p2,f
Term
 Elastic Colision
Definition
 A collision in which KE is conserved
Term
 Inelastic Collision
Definition
 A collision in which KE is not conserved
Term
 Perfectly Inelastic Collision
Definition
 The colliding objects stick together after impact
Term
 Energy
Definition
 The ability to do work
Term
 Work
Definition
 W=F•dll N•m=J=Joule
Term
 Kinetic Energy (KE or K)
Definition
 Energy of motion K=½mv2 J=Joules
Term
 Work-Energy Theorem
Definition
 Wnet=ΔKE=Kf-Ki J=Joules
Term
 Potential Energy (PE or U)
Definition
 Energy of position U=mgh J=Joules
Term
 Conservation of Energy
Definition
 Ki+Ui+W=Kf+Uf J=Joules (W is only included for friction problems)
Term
 Springs
Definition
 Force=Fspring=kx Potential Energy=Uspring=½kx2 J=Joules
Term
 Power
Definition
 P=W/t=work/time Joules/second=W=Watts
Term
 Centripital Acceleration (ac)
Definition
 The acceleration keeping an object in motion in uniform circular motion ac=v2/r m/s2
Term
 Gravatational Force (FG)
Definition
 Gravatational Force=FG=GM1M2                                    r2 Gravational Potential Energy=UG=GM1M2                                                r   N=Newtons
Term
 Period (T)
Definition
 T=1/ƒ Period of Oscillation for a Spring=T=2π√(m/k) Period of Oscillation for a Pendulum=T=2π√(L/g) cycle/second=Hz=Hertz
Term
 Internal Energy (U)
Definition
 The sum of all the of the molecules in a substance   J=Joules
Term
 Temperature
Definition
 THe average kinetic energy per molecule K=Kelvin
Term
 Thermal Expansion
Definition
 ΔL=[image]L0ΔT m
Term
 Rate of Heat Transfer (H)
Definition
 H=kAΔT    L Metals carry heat better than non-metals More are makes it easier for heat to flow The longer the distance, the slower the heat transfer
Term
 Ideal Gas Law
Definition
 Moles of Gas=PV=nRT   Molecules of Gas=PV=NkbT
Term
 Kinetic Theory of Gas
Definition
 Molecules move in continuous randomn motion Large amounts of molecule in any gas container Large separation between molecules Molecules do not affect other molecules All collisions are elastic Molecular Kinetic Energy (U or K) =Kavg=3/2nRT vrms=Γ3kbT    √  m
Term
 First Law of Thermodynamics
Definition
 ΔU=Q+W Internal Energy=heat added+work done on the gas   Q: negative if heat removed; positive if heat added W: negative if gas expanded; positive if gas compressed
Term
 Four Types of Processes
Definition
 [image] Isothermal: the gas is held at constant temperature Adiabatic: no heat flows into or out of the gas Isobaric: the gas is held at constant pressure Isochoric: the gas is held at constant volume
Term
 Work Done by a Gas
Definition
 -PΔV=W J
Term
 Second Law of Thermodynamics
Definition
 Heat flows naturally from a hot object to a cold object
Term
 Heat Engines
Definition
 [image] Efficiency=e=W/QH (e<1) eideal=TH-TC         TH
Term
 Refridgerator
Definition
 [image]
Term
 Entropy
Definition
 The entropy of a system cannot decrease unless work is done on that system
Term
 Pressure (P)
Definition
 P=Force     Area Pressure in a Static Column=P=P0+ρgh N/m2=Pa=Pascals
Term
 Density (ρ)
Definition
 ρ=Mass        Volume kg/m3
Term
 Bouyancy
Definition
 The bouyant force of an object is equal to the weight of the fluid displaced by the object FB=(ρfluid)(Vsubmerged)g   Vsubmerged=ρobject Vobject     = ρfluid
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