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A level physics ocr year 1 vocab
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- 1AccelerationThe rate of change of velocity, a vector quantity
- 2Acceleration of free fallThe rate of change of velocity of an object falling in a gravitational field, symbol g
- 3Air resistanceThe drag or resistive force experienced by objects moving through air
- 4AmmeterA device used to measure electric current - It must be placed in series and ideally have zero resistance
- 5AmpereThe base SI unit of electric current, symbol A, defined as the current flowing in two parallel wires in a vacuum 1m apart such that there is an attractive force of 2.0 x 10^-7N per metre length of wire between them
- 6Amplitude (waves)The maximum displacement from the equilibrium position (can be positive or negative)
- 7Angle of incidenceThe angle between the direction of travel of an incident wave and the normal at a boundary between two media
- 8Angle of reflectionThe angle between the direction of travel of a reflected wave and the normal at a boundary between two media
- 9AnionA negatively charged ion, one which is attracted to an anode
- 10AnodeA positively charged electrode
- 11Antiparallel (vectors)In the same line but opposite directions
- 12AntiphaseParticles oscillating completely out of step with each other (one reaches its maximum positive displacement as the other reaches its maximum negative displacement) are in antiphase
- 13Archimedes' principleThe upthrust on an object in a fluid is equal to the weight of the fluid it displaces
- 14Average speedThe rate of change in distance calculated over a complete journey
- 15Average velocityThe change in displacement Δs for a journey divided by the time taken Δt; Δs/Δt
- 16Base unitOne of seven units that form the building blocks of the SI measurement system
- 17BatteryA collection of cells that transfers chemical energy into electrical energy
- 18Braking distanceDistance travelled by a vehicle from the time the brakes are applied until the vehicle stops
- 19Breaking strengthThe stress value at the point of fracture, calculated by dividing the breaking force by the cross-sectional area
- 20BrittleProperty of a material that does not show plastic deformation and deforms very little (if at all) under high stress
- 21CapacitorA component that stores charge, consists of two plates separated by an insulator (dielectric)
- 22CathodeA negatively charged electrode
- 23CationA positively charged ion, one which is attracted to a cathode
- 24CellA device that transfers chemical energy into electrical energy
- 25Centre of gravityAn imaginary point at which the entire weight of an object appears to act
- 26Centre of massA point through which any externally applied force produces straight line motion but no rotation
- 27Charge carrierA particle with charge that moves through a material to form an electric current - for example, an electron in a metal wire
- 28Closed systemAn isolated system that has no interaction with its surroundings
- 29CoherenceTwo wave sources, or waves, that are coherent have a constant phase difference
- 30Component (vectors)One of the two perpendicular vectors obtained by resolving a vector
- 31CompressionThe decrease in length of an object when a compressive force is exerted on it
- 32Compression (waves)A moving region in which the medium is denser or has higher pressure than the surrounding medium
- 33Compressive deformationA change in the shape of an object due to compressive forces
- 34Compressive forceTwo or more forces together that reduce the length or volume of an object
- 35Conservation of chargeA conservation law which states that electric charge can neither be created nor destroyed - the total charge in any interaction must be the same before and after the interaction
- 36Constant speedMotion in which the distance travelled per unit time stays the same
- 37Constant velocityMotion in which the change in displacement per unit time stays the same
- 38Constructive interferenceSuperposition of two waves in phase so that the resultant wave has greater amplitude than the original waves
- 39Conventional currentA model used to describe electric current in a circuit - conventional current travels from positive to negative - it is the direction in which positive charges would travel
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- A level Physics Fichas sobre A level physics ocr year 1 vocab, creado por Emily Kellett el 08/08/2017.
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- Emily Kellett
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