Science-Physics
What does the triangle in the SHC equation mean
the change in
what is a system
What is the unit for kinetic energy
joules
What is the unit for mass
kg
What is the unit for speed
mps
What is the unit for elastic potential energy
joules
What is the unit for the spring constant of a object
newton per minute n/m
What is extention measured in
metres m
What is the unit for gravitational potential energy
joules j
What is the unit for gravitational field strength
newtons per kilogram n/kg
What is the unit for height
metres m
What is the unit for the change in thermal energy
joules j
Power is the rate at which
energy is transferred
What is the unit for power
watts w
What is the unit for energy transferred
joules
What is the definition of work done
What is the unit of work done
joules
What does GKCEMENT stand for
gravitational kinetic chemical elastic magnetic electrostatic nuclear thermal
Efficiency can never be greater than
100%
efficiency of energy transfer=
useful power output/total power output*100
What does the term non renewable mean
Something that will eventually run out
What are biofuels made from
biomass e.g organic matter
name all non renewable fuels
gas oil coal e.g fossil fuels
name all renewable fuels
wind waves guisers solar
What are the three fossil fuels
gas oil coal
advantages and disadvantaged of fossil fuels
they are very available and efficient
they are bad for the environment Co2 emmitions
advantages and disadvantages of bio fuels
environmentaly friendly less Co2
could impact food production made from food and is expensive
advantages and disadvantages of nuclear fuels
highly efficient a lot of it
could be accidents and the radiation last for ages
base load is
the minimum amount of electricity required by the national grid a week
the start up time is
the time taken to put a power station into operation
the capital cost is
the cost to build and decommision
the total cost is
the running cost for fossil fuels and maintenence
what is a closed system
a group of objects interacting with each other where no energy is lost
what is a open system
a group of objects interacting with each other where energy can be lost
what is the equation for work done
work done=force*distance travelled
how to calculate GPE
mass*height*gfs
how to calculate elastic potential energy
1/2 spring constant*extention sq
How to calculate the E.P.E
1/2Spring constant*(extension)sq
how to calculate K.E
1/2mass*speed sq
A conductor is good because it
can transfer heat more efficiently
what is conduction
when heat moves from one object to another object through direct touch
what is convection
the process of transferring heat through air or liquid currents
what is radiation
Energy released in the form of particle or electromagnetic waves
4 methods of energy transfer
electricity
heat
mechanical
radiation
power is
work divided by time
what is the equation of work done
work done=force*distance travelled
what does a ammeter measure
electric current
what does a voltmeter measure
voltage
4 types of enrgy transfers
electrically, by heating, mechanically and by radiation