Physics unit 3 0.0 / 5 ? PhysicsA2/A-levelOCR Created by: lauraCreated on: 22-05-13 12:47 Newton's 1st law a force is necessary to change the state of rest or of uniform motion in a straight line of body 1 of 19 Newton's 2nd law rate of change or momentum of an object is directly proportional to the net force acting upon it 2 of 19 Newton force that gives a mass of 1 kg an acceleration of 1 metre per second every second 3 of 19 Newton's 3rd law when body a exerts a force on body b, body b exerts a force back on body a that is equal opposite in direction and of the same type 4 of 19 Prinsiple of conservation of momentum in any direction, in the absence of external forces, the total momentum of a system remains constant 5 of 19 Impulse = to the change in momentum of a body. = to the area under a force-time graph 6 of 19 elastic collsion no momentum or ke is lost 7 of 19 Inelastic collision momentum is conserved but ke is lost 8 of 19 Radian One radian is the angle subtended at the centre of a circle by an arc of length = to the circle's radius 9 of 19 Gravitational field strength at any point it's the force acting per unit mass at that point 10 of 19 Gravitational force GF between 2 bodies is directly proportional to the product of their masses and inversely proportional to the square of the distance between them 11 of 19 Kepler's 3rd law the period of a planet squared = the mean radius of it's orbit cubed 12 of 19 Resonance is the build-up of a large-amplitude oscillation when the frequencies of vibration objects match 13 of 19 Internal energy is the sum of the random distributions of ke and pe of all the molecules in the body 14 of 19 Ideal Gas Has internal energy only in the form of random kinetic energy 15 of 19 Specific heat capacity quantity of thermal energy required to raise the temperature of a unit mass by a unit temperature rise 16 of 19 Specific latent heat of fusion quanity of energy per unit mass needed to change a solid into a liquid 17 of 19 specific latent of vaporisation quantity of energy per unit mass needed to change a liquid to a gas 18 of 19 Boyle's law the volume of a fixed mass of gas is inversely proportional to the pressure exerted on it, provided the temperature is kept constant 19 of 19
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