units 1-5 physics

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draw an energy transfer diagram for the energy transfer in a motor
(just search up energy trans diagram)
1 of 30
list the energy transfers that happen while a radio is on and the processes that help make these happpen
chemical energy transferred from batteries to speakers to surroundings by radiation and heating
2 of 30
why does a bungee not return to its original height?
energy is lost to the surroundings.
3 of 30
what is the law of energy?
energy cannot be created or destroyed, only transferred from one store to another or dissipated to the surroundings
4 of 30
what is the equation for specific heat capacity?
change in energy = mass x specific heat capacity x temp change
5 of 30
what is the unit for specific heat capacity?
J/kg
6 of 30
define the term 'thermal conductivity'
the rate energy is transferred through a substance
7 of 30
give three materials with high thermal conductivity, and three with low
gold, copper, aluminium
stone, wood, plastic
8 of 30
describe the process of finding the specific heat capacity of aluminium
surround block w. insulation, connect to heater, connect to joulemetre, insert thermometer into block, measure temp w. th, turn on heater, wait 10 min, measure temp w. th again, measure energy used on joule metre, use equation to find s.h.c
9 of 30
give three ways you could insulate a home
loft insulation, foil behind radiators, double glazing, insulate walls, thicker bricks,
10 of 30
what is a vacuum
where there are no particles at all
11 of 30
what makes metals good conductors, and non-metals not good conductors?
metals have free electrons, non-metals do not
12 of 30
the walls of a home have high thermal conductivity. will it lose heat fast or slow?
fast
13 of 30
GIVE FOUR FACTS ABOUT INFRARED RADIATION GO GO GO
- can travel through a vacuum
- travels in straight lines
- can be reflected
- travels at the speed of light
;)
14 of 30
how are energy demands mostly met?
by burning fossil fuels like coal, oil and gas
15 of 30
does nuclear or fossil fuels produce more energy per kg?
nuclear
16 of 30
describe how electricity is generated (4 points)
- water is heated in a boiler to create steam
- steam spins turbine blades
- turbine turns generator, generating electricity
- then it goes to a transformer, converted to be usable
17 of 30
how is acid rain generated?
how to reduce?
impurities in coal and oil, like sulphur, released into the air to create sulfuric acid clouds which rain down killing plants
stop using so many fossil fuels, use catalytic converters, desulphurisation plants
18 of 30
order oil, coal, gas, hydroelectric and nuclear into order of start up times.
hydroelectric, gas, oil, coal, nuclear
19 of 30
what is a baseload?
a constant supply of power that's on all the time
20 of 30
when are gas fired power stations useful and why?
in moments of peak demand because they have such a short start-up time
21 of 30
why do electrons want to jump away from each other?
they are all negatively charged, and like charges repel
22 of 30
what is static electricity?
the jump of electrons from an area where there is more of them to an area where there's less when two objects are rubbed together
23 of 30
what does static electricity require?
an insulator and friction
24 of 30
what happens to an earthed object if the charge is great enough?
the electrons jump across to it
25 of 30
the max speed of a cyclist on a level road is 14m/s
how does cycling up hill affect the max speed (3)
cycling uphill will decrease the max speed.
as the incline increases, more of the cyclist's energy will go into the gravitational potential store, rather than the kinetic store
26 of 30
when wiping a tv with a dry cloth on a dry day, it becomes more dusty
why?
when rubbing with the cloth, a charge is created, which attracts dust of the opposite charge
27 of 30
what is the equation to calculate current? with units
charge C / time s
28 of 30
equation to calculate potential difference with units
pot. dif (V) = energy transferred / charge
29 of 30
equation to calculate resistance with units
resistance (ohms) = potential dif (V) / current(A)
30 of 30

Other cards in this set

Card 2

Front

list the energy transfers that happen while a radio is on and the processes that help make these happpen

Back

chemical energy transferred from batteries to speakers to surroundings by radiation and heating

Card 3

Front

why does a bungee not return to its original height?

Back

Preview of the front of card 3

Card 4

Front

what is the law of energy?

Back

Preview of the front of card 4

Card 5

Front

what is the equation for specific heat capacity?

Back

Preview of the front of card 5
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