conservation of energy Flashcards
kinetic energy
kinetic energy =
0.5× mass × speed2
gravitational potential energy
GPE = mass × gravitational field strength × height
power=
work done/time taken
energy transferred/ time taken
change in thermal energy =
mass × specific heat capacity × temperature change
elastic potential energy
0.5 × spring constant x (extension)2
distance travelled
average speed x time
force
mass x acceleration
velocity
acceleration x time
energy transferred
efficiency x energy supplied
energy transferred
efficiency x energy supplied
A sports scientist analyses an athlete’s throw to help improve performance. The scientist takes pictures of the athlete every 0.1 s during one throw.
Explain how the scientist could improve this method of analysing the throw.
take pictures more frequently
in order to determine the exact time of release
A student investigates how the average speed of the trolley varies with starting height.
Describe how the student can determine the average speed of the trolley.
measurement of time between 2 distances
measure of distances along the runway
measure of vertical to starting position
average speed= distance travelled/time
The water in the panels reaches a constant temp even tho still absorbing energy from sun.
Why
Heat is lost
Heat is gained
Heat is lost=heat is gained
Energy transfer from bunsen burner
Chemical to thermal
Explain why heating the water using a kettle and bunsen burner waste different amounts of energy
Kettle is insulated
Kettle keeps in more energy
The energy reaching the ISS from the sun is carried by waves which are
Transverse and electromagnetic
Pro and con of tidal power
Pro
Renewable
Reliable
Reduces reliance of fossil fuels
Cons
Not continuous
Exoensuve
Disturbes wild life like fish
High cost
Explain why changing halogen lamps for energy saving lamps wont keep chicks warm
May have to use more lamps cause the lamps wont get that hot
Compare hydro and solar
Both renewabke
Both saves fossil fuels
Hydro only possible in some locations so can damage environment
Solar aint reliable
Dependent on sunshine
Pro and con of nuclear power
Last long time
No co2
No sulfur dioxide
Dont add to global warm
Reliable
Cons
Radioactive waste
Waste material that cant be normally exposed
Accidents
Isnt trusted
Why r the pipes on solar power black
Good absorber of heat
Takes in more energy
Antarctic ice melts surface area decreases
Area of water surface increases
What happens to the amount of radiation absorbed
And what effect will it have on the water
More radiation is absorbed
Water reflects less than ice
Temp rises
Kettle energy transfer
Electrical to thermal
Barbacue energy transfer
Chemical to thermal
