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Descripción
Fichas por Emily Kellett, actualizado hace más de 1 año
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Creado por Emily Kellett
hace más de 7 años
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| Pregunta | Respuesta |
| Acceleration | The rate of change of velocity, a vector quantity |
| Acceleration of free fall | The rate of change of velocity of an object falling in a gravitational field, symbol g |
| Air resistance | The drag or resistive force experienced by objects moving through air |
| Ammeter | A device used to measure electric current - It must be placed in series and ideally have zero resistance |
| Ampere | The 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 |
| Amplitude (waves) | The maximum displacement from the equilibrium position (can be positive or negative) |
| Angle of incidence | The angle between the direction of travel of an incident wave and the normal at a boundary between two media |
| Angle of reflection | The angle between the direction of travel of a reflected wave and the normal at a boundary between two media |
| Anion | A negatively charged ion, one which is attracted to an anode |
| Anode | A positively charged electrode |
| Antiparallel (vectors) | In the same line but opposite directions |
| Antiphase | Particles 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 |
| Archimedes' principle | The upthrust on an object in a fluid is equal to the weight of the fluid it displaces |
| Average speed | The rate of change in distance calculated over a complete journey |
| Average velocity | The change in displacement Δs for a journey divided by the time taken Δt; Δs/Δt |
| Base unit | One of seven units that form the building blocks of the SI measurement system |
| Battery | A collection of cells that transfers chemical energy into electrical energy |
| Braking distance | Distance travelled by a vehicle from the time the brakes are applied until the vehicle stops |
| Breaking strength | The stress value at the point of fracture, calculated by dividing the breaking force by the cross-sectional area |
| Brittle | Property of a material that does not show plastic deformation and deforms very little (if at all) under high stress |
| Capacitor | A component that stores charge, consists of two plates separated by an insulator (dielectric) |
| Cathode | A negatively charged electrode |
| Cation | A positively charged ion, one which is attracted to a cathode |
| Cell | A device that transfers chemical energy into electrical energy |
| Centre of gravity | An imaginary point at which the entire weight of an object appears to act |
| Centre of mass | A point through which any externally applied force produces straight line motion but no rotation |
| Charge carrier | A particle with charge that moves through a material to form an electric current - for example, an electron in a metal wire |
| Closed system | An isolated system that has no interaction with its surroundings |
| Coherence | Two wave sources, or waves, that are coherent have a constant phase difference |
| Component (vectors) | One of the two perpendicular vectors obtained by resolving a vector |
| Compression | The decrease in length of an object when a compressive force is exerted on it |
| Compression (waves) | A moving region in which the medium is denser or has higher pressure than the surrounding medium |
| Compressive deformation | A change in the shape of an object due to compressive forces |
| Compressive force | Two or more forces together that reduce the length or volume of an object |
| Conservation of charge | A 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 |
| Constant speed | Motion in which the distance travelled per unit time stays the same |
| Constant velocity | Motion in which the change in displacement per unit time stays the same |
| Constructive interference | Superposition of two waves in phase so that the resultant wave has greater amplitude than the original waves |
| Conventional current | A 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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