Physics unit 4 definitions. (unfin) 3.0 / 5 based on 1 rating ? PhysicsA2/A-levelOCR Created by: PhilCreated on: 10-04-13 19:26 Gravitational field strength Gravitational force per unit mass at a point. 1 of 33 Newton's law of universal gravitation F=-Gm1m2/r^2 2 of 33 internal Energy at absolute 0 Is at a minimum 3 of 33 Average Ke of a molecule E = 3/2kT 4 of 33 Boyle's Law Pressure is inversely proportional to volume for a fixed mass of gas at a const temp. 5 of 33 Brownian motion Shows gas molecules have rapid and random motion. 6 of 33 Centipetal acceleration a= V^2/r 7 of 33 Centripetal Force F=mv^2/r 8 of 33 Simple harmonic motion It's acceleration is always directed toward the equilibrium position and the acceleration is always proportional to it's displacement. 9 of 33 SHM displacement. X= A sin 2(Pi)ft or x=A cose2(pi)ft 10 of 33 Forced oscillations A periodic force is applied 11 of 33 Light damping There is an exponential decrease in amplitude over several oscillations. 12 of 33 Critical damping The mass retuns to rest in the shortest possible time without over shooting. 13 of 33 Resonance A periodic force is applied to a system at the same freq as it's natural frequency resulting in oscillations of max amp. 14 of 33 Internal energy of a gas If the sum of all the randomly dist kinetic and potential energies of all it's molecules. 15 of 33 Specific heat capacity The energy needed to change a temperature of 1kg of a substance by 1oC 16 of 33 SHC formula E=Mc(delta Pheta) 17 of 33 Ideal gas law pV = nRT or pV= NkT 18 of 33 gas law Sometimes used as p1V1/T1 = p2V2/T2 19 of 33 Ideal gas (Assumptions) The molecules make elastic collisions, there are no inter molecular forces. 20 of 33 Newton's first law. Every body remains in a state of rest or of uniform motion in a straight line (const velo) unless acted upon bu a resultant force. 21 of 33 Newton's 2nd Law The rate of change of a momentum of a body is proportional to the resultant force which acts on it and occurs in the direction of the force. 22 of 33 Newton's third law If Body A exerts a force on Body B, Then body B exerts an equal and oppo force on body A. 23 of 33 Momentum Mass x Velocity. 24 of 33 Ft (Impulse) Mu=Mv Change in momentum. 25 of 33 The law (or principle) of Conservation of momentum If no resultant force acts on a system of objects the TOTAL momentum (mass and velo) does not change. 26 of 33 Elastic collisions. Collisions where Ke is conserved. 27 of 33 Geostationary Satellies Orbit above a fixed point on the equator with a period of 24hrs. 28 of 33 Kepler's third law. T^2 ∝ R^3 29 of 33 Temperatures in kelvin. +273.15 30 of 33 Mole Contrained 6.02 * 10^23 particles 31 of 33 Latent heat of Fusion Energy needed to change the state of a solid to a liquid without a change in temperature. 32 of 33 Latent heat of vaporisation. The energy needed to change the state of a liquid to a gas without a change in temperature. 33 of 33
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