AS Level Physics Definitions 5.0 / 5 based on 5 ratings ? PhysicsAll topics definitionsASCIE Created by: ish0113Created on: 13-03-20 06:10 Scalar Has magnitude only. Eg: Mass, Volume, Energy 1 of 41 Vector Has magnitude and direction. Eg: Force, Velocity, Acceleration 2 of 41 Accuracy How close the measured value is to true value 3 of 41 Precision Very little spread about the mean value 4 of 41 Uncertainty Range of values in which the measurement can lie 5 of 41 Distance Length between two points measured along the straight line joining the two points 6 of 41 Displacement Distance from a fixed reference point in a specific directioon 7 of 41 Speed Distance travelled per unit time 8 of 41 Velocity Change in displacement per unit time 9 of 41 Acceleration Rate of change of velocity 10 of 41 Mass Total amount of matter in a body 11 of 41 Weight Gravitational pull on a body 12 of 41 Linear momentum Product of mass and velocity 13 of 41 Centre of gravity A point through which all the weight is considered to act 14 of 41 Density Mass per unit volume 15 of 41 Pressure Force per unit area 16 of 41 Work done Product of force and perpendicular distance moved in the direction of force 17 of 41 Energy Ability to do work 18 of 41 Power Rate of doing work 19 of 41 Stress Force per unit cross sectional area of wire 20 of 41 Strain Extension per unit length of unstretched wire 21 of 41 Amplitude Maximum displacement from its equilibrium position 22 of 41 Period Time taken for one complete oscillation 23 of 41 Frequency Number of complete oscillations per unit time 24 of 41 Wavelength Distance between two points on successive oscillations that are vibrating exactly in phase 25 of 41 Wave speed Distance travelled by wave energy per unit time 26 of 41 Intensity Energy transmitted per unit time per unit cross sectional area at right angles to the wave velocity 27 of 41 Doppler Effect Change in frequency of waves due to the relative motion of the wave source and observer 28 of 41 Constructive interference If two sets of waves are in phase, the combined amplitude of both the waves is equal to the sum of amplitudes of the two individual waves 29 of 41 Destructive interference If two waves are 180 degrees out of phase, the waves cancel each other out 30 of 41 Electric field strength Force per unit positive charge on a stationary point charge 31 of 41 Current Movement of electric charge 32 of 41 Potential difference Work done in moving a unit positive charge from one place to another 33 of 41 Resistance Potential difference/Current 34 of 41 Proton Number Number of protons in an atom 35 of 41 Nucleon Number Number of protons + Number of neutrons in an atom 36 of 41 Isotopes Atoms of the same element with same number of protons but different number of neutrons 37 of 41 Nuclide Single type of nucleus with specific proton number and specific nucleon number 38 of 41 Leptons Electrons, neutrions, antinutrions and positron which have no further structure 39 of 41 Hadrons Protons, neutrons and their antiparticles 40 of 41 Quarks Different type of hadrons, each type made up of different combinations of two or three smaller particles 41 of 41

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