topic 3 - conservation of energy

(3.1) what equation do you use to calculate the change in gravitational potential energy (when an object is raised above the ground)

mass x gfs x vertical height

free card

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(3.4) define the term ‘conservation of energy’

energy cannot be created or destroyed but only transferred from one store to another

(3.5) what energy store is fuel, food, battery

chemical

(3.5) give an example of chemical energy store

fuel/food/battery

(3.5) what energy store is moving objects

kinetic

(3.5) give an example of kinetic energy store

moving objects

(3.5) what energy store is raised mass

gravitational potential

(3.5) give an example of gravitational potential energy store

raised mass

(3.5) what energy store is stretched string

elastic

(3.5) give an example of elastic energy store

stretched string

(3.5) what energy store is 2 magnets

magentic

(3.5) give an example of magnetic energy store

2 magnets

(3.5) give an example of magnetic energy store

2 magnetics

(3.5) what energy store is two charges

electrostatic

(3.5) give an example of electrostatic energy store

two charges

(3.5) give an example of nuclear energy store

radioactive decay

(3.5) what type of energy store is radioactive decay

nuclear

(3.6) when there are energy transfers in a closed system…..

there is no net change in the total energy in the system

(3.6) when is there no net change to the total energy change in a system

closed system

(3.6) what is a closed system

energy can flow in or out of the system but there is no transfer of mass

(3.7) some energy will be usefully transferred, and some will be ________ or d_______

wasted or dissipated

(3.7) mechanical processes become wasteful when….

they lead to a rise in temperatures of the surroundings through heating

(3.8) what are the four different ways energy can be transferred

mechanically, electrically, thermally, radiation

(3.8) mechanically

by a force moving through a distance

(3.8) by a force moving through a distance

mechanically

(3.8) electrically

by the use of electric current

(3.8) by the use of electric current

electrically

(3.8) thermally

because of a difference in temperature

(3.8) because of a difference in temperature

thermally

(3.8) radiation

by waves (such as electromagnetic or sound)

(3.8) by waves such as electromagnetic or sound

radiation

(3.10)the rate at which thermal energy is transferred through a wall of a house depends on:

• the difference in temperature between areas

• thickness of walls

• material that the walls are made of

(3.9) unwanted energy transfers can be reduced by

thermal insulation and lubrication

(3.13) what is a renewable energy source

will not run out

(3.13) describe hydroelectricity

generates electricity from water behind a dam flowing down a pipe and turning a turbine to generate electricity

(3.13) describe win turbines

use kinetic energy from wind to generate electricity

(3.13) describe tidal power

uses the rise and fall of the tide or tidal currents to generate electricity

(3.13) describe solar cells

coverts energy from the sun directly to electricity

(3.13) what are non-renewable resources

resources that will eventually run out