Physics G484 Definitions 3.0 / 5 based on 1 rating ? PhysicsA2/A-levelOCR Created by: ImmyCreated on: 13-12-12 18:36 Linear momentum mass multiplied by its velocity 1 of 24 Principle of conservation of momentum When bodies interact, their total momentum is constant, provided no external force acts 2 of 24 Newton's first law An object continues in a state of rest or uniform motion in a straight line unless acted on by a net force 3 of 24 Newton's second law When a net force acts on an object, the rate of change of momentum is equal to the force producing it, and takes place in the direction of the force 4 of 24 Newton's third law When two objects interact, the forces they exert on each other are equal in magnitude, but they act in opposite directions 5 of 24 Impulse change in momentum 6 of 24 Gravitational field strength Force per unit mass that acts on an object placed at that point 7 of 24 Simple harmonic motion When the acceleration of mass is directed towards a fixed point and is proportional to its displacement from that point 8 of 24 Free oscillations Mass vibrates freely at its natural frequency 9 of 24 Displacement Distance of the mass from its equilibrium position 10 of 24 Amplitude Greatest value of the displacement 11 of 24 Period Time for one complete oscillation 12 of 24 Frequency Number of oscillations per second 13 of 24 Angular frequency Number of oscillations per second, measured in radians 14 of 24 Resonance When the forcing frequency matches the natural frequency of free oscillations, the amplitude increases to a large value 15 of 24 Internal energy The internal energy of a system is the sum of a random distribution of kinetic and potential energies associated with the particles of the system 16 of 24 Pressure Force per unit area 17 of 24 Thermal energy When energy is transferred because of a temperature difference 18 of 24 Thermal equilibrium When two objects/regions are at the same temperature, no thermal energy is transferred between them 19 of 24 Specific heat capacity The amount of energy needed to raise the temperature of 1kg of the substance by 1K 20 of 24 Latent heat of fusion The energy which must be supplied to fuse a substance (melt it) 21 of 24 Latent heat of vaporisation The energy which must be supplied to vaporise a substance (liquid to gas) 22 of 24 Boyle's law Volume is inversely proportional to pressure 23 of 24 Ideal gas Any gas which obeys the relationship pV/T = constant 24 of 24
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