Flashcards
p2 physics topic 1
Cards in this deck (51)
- 1what is the equation for efficiency?useful energy output
divided by
useful energy input - 2what are the five diffrent types of energy?kinetic
sound
thermal
gravitational
chemical - 3what is the meaning for the term "mechanically"force acting on an object
e.g: pushing and stretching - 4what is the meaning for the term: "electrically"a charge doing work against resistance
- 5what is a closed system?where no energy is transferred in or out of the system
- 6what is the equation for work done?wd =
force times distance - 7what are the five main unit conversions in physics?1 kg ---1000g
500g---5n
40cm--0.4 m
70 kg---700n
4000 kg---40000n - 8what is the equation for gravitational potential energy?gpe= mass times change in height times gfs
- 9how do you work out gravitational field strengthchange in height times mass times 10
- 10what does the word "dissipated mean"where energy is lost to the enviroment
- 11what are the four examples of contact forces?friction
air resistance
tension
reaction - 12what are the three examples of non-contact force?gravitational forces
electrostatic forces
magnetic forces - 13what is newtons third law?whenever two objects interact both objects fell an equal but opposite force
- 14what is the distance between scalar and vector quantitiesvector have a size and direction
scalar just have a size - 15what is the equation for kinetic energy?1/2 mass times velocity squared
- 16what is a series cuircuitwhen there is only one connection
- 17what is a parellel circuitwhen there is two connections
- 18what is an electronelectricity ions
- 19what is a coulomb?measurement of electricity
- 20what is a resistor?slows down current
- 21what is a currentrate of flow of charge of electrons around a circuit
- 22what ks resistance measured inohms
- 23how do you work out currentcharge divided by time
- 24what will happen to the LDR in the darkthe LDR has a high resistance
the current will be low - 25what hapenes to the LDR when it is lightLDR has a low resistance
the current will be high - 26equation for powercurrent times p.d
- 27what is a diodein a diode
current flows one direction
high resistance in reverse direction - 28what happenes in a filament lamptemperature increases as current increase
makes them harder to flow
graph gets less steep - 29what happens in a fixed resistorcurrent directly proportional to potential difference
so you get straight line
because the resistance in constant - 30what is a thermistor?a resistor that changes with temperature
- 31what are the three diffrent wires calledearth wire
live wire
neutral wire - 32what does the neutral wire docompletes circuit
flows through live wire
out through neutral
the wire is the colour blue - 33what does the live wire docarries voltage
alternates between high +ve and -ve voltage
it is the colour brown - 34what does the earth wiresafety wire
carries current away if something goes wrong
always at 230v - 35what is a magnetismforce that acts only between magnetic materials
steel, nickel, iron and cobalt - 36what have all elctromagnetic waves have in common?they all travel at the same speed through a vacuum
- 37what are the seven basic types of EM waves?radiowaves
microwaves
infra red
visible light
ultra violet
x-rays
gamma rays - 38why do microwaves use diffrent wavelength from satelites?the wavelength used for satellites and phones are easily absorbed by water molecules.
- 39magnetic fieldsall magnets have magnetic field around them
- 40magnetsthe closer the magnet the stronger the magnetic field
- 41step-up transformersas the current is increased the p.d is decreased
- 42step -down transformersas the pd is decrease the current is increased
- 43transformers have two coils of wireprimary(electricity flows through)
secondary - 44permanent magnetsproduce their own magnetic field
- 45temporary magnetsonly produce magnetic field when they are in another magnet
- 46magneticfridge door-permanent
- 47uniform magnetic fieldsame strength and direction
- 48how to work out densitymass divided by volume
- 49densityhow much maas in a certain space
- 50changes of statesolid-liquid=melting
liquid-gas=boiling/evaporation
solid-gas=sublimation
liquid to solid=freezing
gas-liquid=condensing - 51—
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- Flashcards on p2 physics topic 1, created by Maryam zareen on 06/11/2017.
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- Maryam zareen
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