# Shared Flashcard Set

## Details

Physics Equations
Physics Equations
17
Physics
06/07/2011

Term
 Kinetic Theory of Gases
Definition
 1) A gas consists of a large number of molecules2) Molecules move with a range of speeds3) The volume of the molecules is negligible compared with the volume of the gas itself4) the collisions of the molecules with each other and the container walls are elastic5) Molecules exert no forces on each other or the container except when in contact6) Duration of collisions is very small compared with time between collisions7) Molecules obey Newton's laws of mechanics
Term
 Conservation of Momentum
Definition
 No external forces - momentum stays the same.(m1v1 + m2v2)before = (m1v1 + m2v2)after
Term
 Total momentum of a System
Definition
 m1v1 + m2v2 = Ptotal (total momentum)
Term
 Impulse
Definition
 Average Fnet = ΔP/ΔTIf ΔT is infinitesimally small, this is the instantaneous force - not average.Area under F - t graph is Impulse.
Term
 Momentum
Definition
 p = mv
Term
 Net Force
Definition
 Fnet = ma
Term
 Acceleration
Definition
 a = Δv/Δt
Term
 Velocity
Definition
 v = Δd/Δt
Term
 Work
Definition
 W = Fd cosθ1J = 1 Newton-meterWhen net force F performs W work on body, kinetic energy changes by WW can also equal to ΔE when resistive forces such as friction exist (W = ΔE)
Term
 Potential Energy
Definition
 Ep = mghChange in potential energy,Ep = mgΔh
Term
 Kinetic Energy
Definition
 Ek = ½ mv^2Change in Kinetic EnergyEk = (½ mv^2)final - (½ mv^2)initial
Term
 Power
Definition
 ΔW/ΔT1 Js-1 or 1 Watt
Term
 Power output
Definition
 Power output = F x v
Term
 Angular Speed
Definition
 ω=2π/TRadians per second, or just s-1
Term
 Centripetal Acceleration
Definition
 Ac = v^2 / R, and is directed towards center
Term
 Law of Gravitation
Definition
 F = G x M1 x M2 / R^2
Term
 Gravitational Field Strength
Definition
 g = G x M / r^2
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