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