MCAT Physics Ch. 2 Equations

12 cards   |   Total Attempts: 182
  

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Cards In This Set

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Kinetic Energy
K = kinetic energym = massv = velocity
  1. K = kinetic energy
  2. m = mass
  3. v = velocity
Elastic Potential Energy
U = potential energyk = spring constant (how stiff spring is)x = the magnitude of how far the spring is pulled out of equilibrium (its relaxed state)
  1. U = potential energy
  2. k = spring constant (how stiff spring is)
  3. x = the magnitude of how far the spring is pulled out of equilibrium (its relaxed state)
U = potential energyk = spring constant (how stiff spring is)x = the magnitude of how far the spring is pulled out of equilibrium (its relaxed state)
Gravitational Potential Energy
An object's potential energy relative to a datum (whatever you have specified as the "ground") U = mgh
  1. U = potential energy
  2. m = mass
  3. g = acceleration due to gravity 9.8 m/s^2
  4. h = high of object from datum ("ground"
Total Mechanical Energy
E = U + K
  1. E = total mechanical energy
  2. U = potential energy
  3. K = kinetic energy
Conservation of Mechanical Energy
ΔE = ΔU + ΔK = 0
  1. ΔE = change in internal energy
  2. ΔU = change in potential energy
  3. ΔK = change in kinetic energy
Work done by nonconservative forces (friction, air resistance, viscous drag)
Wnonconservative = ΔE = ΔU + ΔK
  1. ΔE = change in internal energy
  2. ΔU = change in potential energy
  3. ΔK = change in kinetic energy
Definition of Work (Mechanical)
W = F x d = Fdcosθ
  1. W = work
  2. F= force
  3. d = displacement
W = F x d = Fdcosθ W = work F= force d = displacement
Definition of Work (isobaric gas-piston system, no pressure change)
W = -PΔV
  1. W = Work
  2. P = Pressure
  3. ΔV = change in volume
Definition of Power
P = W/t = ΔE/t
  1. P = power
  2. W = work
  3. t = time
  4. ΔE = change in energy
Work-Energy Theorem
Wnet = ΔK = Kf - Ki
  1. Wnet = net work
  2. ΔK = change in kinetic energy
  3. Kf = final kinetic energy
  4. Ki = initial kinetic energy =
Mechanical Advantage
Mechanical Advantage = Fout/Fin
  1. Fout = the force exerted on an object by a simple machine
  2. Fin = the force actually applied to the simple machine
Efficiency (measure of amount of useful work generated by a machine for a given amount of work put into it)
Efficiency = Wout/Win = (load)(load distance)/(effort)/(effort distance)
  1. Wout = the product of load & load distance
  2. Win = the product of work effort & effort distance
  3. load = how much the object weighs
  4. load distance = how far you want the object to go
  5. effort = how much work you put in to move the object
  6. effort distance = how far you have to move the object for a given amount of effort