Thermal energy, Kinetic energy, Gravitational potential, Elastic potential, Chemical energy, Magnetic energy, Electrostatic energy, Nuclear
1 of 21
describe the energy transfers that occur as a ball drops to the ground
Gravitational potential energy - kinetic
2 of 21
give the equation for finding the energy in an objects kinetic energy store
Kinetic energy = 1/2 X mass X speed2 eK = 1/2mv2
3 of 21
if energy is transferred to an objects kinetic energy store what happens to its speed?
Energy is transferred to this store when an object speeds up, the greater its mass and the faster its going the more energy
4 of 21
give the equation for finding the energy in an objects gravitational potential energy store
eP = mgh GPE = Mass X Gravitational field strength X height
5 of 21
what kind of energy store is energy transferred to when you compress a spring
Elastic potential energy = 1/2 X Spring constant X extension2
6 of 21
what does specific heat capacity of a material mean
How hard it is to heat something up. The amount of energy needed to raise the temperature of 1kg of a substance by 1*
7 of 21
give the equation that relates energy transferred and specific heat capacity
Change in thermal energy = Mass X specific heat capacity X temperature change
8 of 21
describe an experiment to find the specific heat capacity of a material
A block with two holes to stick a thermometer and a heater in. Measure the mass of the block and wrap in insulating layer. Measure initial temperature. As bock heats up take readings on thermometer and current on voltmeter every min for 10 mins...
9 of 21
state the conservation of energy principle
energy can be transferred usefully, stored or dissipated, but can never be created or destroyed
10 of 21
define power, and give two equations to calculate it
Power is the rate of energy transfer or the rate of doing work. Power = energy transfer % time Power = Work done % time
11 of 21
what are the units of power
Watts
12 of 21
how can you reduce unwanted energy transfers in a machine with moving, touching components
Lubricants can be used to reduce friction
13 of 21
true or false? a high thermal conductivity means there is a high rate of energy transfer
materials with a high conductivity transfer energy between their particles at a faster rate
14 of 21
give four ways to prevent unwanted energy transfers in a home
what is the efficiency of an energy transfer. Give the equation
the less energy that is wasted in an energy store the more efficient. Efficiency = useful output energy transfer % total input energy transfer
16 of 21
name four renewable energy resources and four non renewable
the sun, wind, water waves, hydro-electricity, bio-fuel, tides, geothermal. Coal, oil, gas
17 of 21
what's the difference between renewable and non renewable energy resources
non renewable will run out, renewable can be renewed and not run out. Non is used for petrol form oil, coal for steam, gas for heating, coal for fireplace. Renewable biofuel run vechicals, geothermal energy, solar water heaters
18 of 21
give two ways the environment can be damaged when using fossil fuels
releases co2 which adds to the greenhouse effect, relates sulphur dioxide which causes acid rain which destroys stuff, coal mining ruins landscapes, nucleus waste is very dangerous
19 of 21
give one environmental benefit from using nuclear power
it does not generate polluting emissions such as sulphides, dust or greenhouse gases.
20 of 21
explain why the uk plans to use more renewable energy resources in the future
Burnin fossil fuels really damages the environment, were becoming more aware non renewable resources will run out,
21 of 21
Other cards in this set
Card 2
Front
describe the energy transfers that occur as a ball drops to the ground
Back
Gravitational potential energy - kinetic
Card 3
Front
give the equation for finding the energy in an objects kinetic energy store
Back
Card 4
Front
if energy is transferred to an objects kinetic energy store what happens to its speed?
Back
Card 5
Front
give the equation for finding the energy in an objects gravitational potential energy store
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