a stone held up in the air can do work when dropped because gravity will pull it downwards.
What is gravitational potential energy? aka PE
100
this is a machine for generating energy.
what is a turbine?
100
coal,oil and natural gas
name 3 types of fossil fuels
200
joules is the SI unit for work done.
What is the SI unit for work done?
200
joules.
What is wok and energy measured in?
200
gravitational potential energy= mgh
What is the formula for calculating PE? (gravitational potential energy.
200
industrial societies spend huge amounts of energy. much of the energy is supplied by electricity which comes from generators in power stains.
what is generators in power stations?
200
these are fuels made from plant or animal matter.
What are bio-fuels?
300
elastic potential energy is a stretched rubber band can do work when realeased so can a compressed spring. so both have elastic potential energy
What is elastic potential energy?
300
energy cannot be made or destroyed but it can change from one form to another.
What is the law of conservation?
300
this is energy due to motion. all moving objects have kinetic energy.
What is kinetic energy?
300
thermal energy to produce steam or water comes from burning fuel or a nuclear reactor
What is nuclear reactor?
300
solar panels absorb this energy and use it to heat water. solar cells are made from materials that can deliver an electric current.
What is solar energy?
400
35mj x 1000000= 35000000
express the following number is joules:
35mj
400
to do work you have to spend energy but energy doesn't vanish or disappear it goes somewhere else.people talk about using energy but its never used up. its changed into different forms.
What is the conservation of energy?
400
potential energy= 2kg x 3m x 10N/kg= 60J
calculate when 2kg of mass is 3m above the ground and g is 10N.
400
a dam is built across a river were it meets. the lake behind the dam fills when the tide comes in and empties when the tide goes out.
What is a tidal power scheme?
400
a lake fills when the tide comes in and empties when it goes out.
What is tidal energy?
500
W= F x D
w= 12N x 5m= 60J
W= 60J
how much worck is done in a force of 12N moves an object ma distance of 5N?
500
when energy changes from one form to another its means that energy is transformed. e.g you can have kinetic into thermal energy.
What does it mean by the term 'energy is transformed'
500
KE= 1/2 x 2kg x 3m/s = 1/2 x 3 (to the power of 2) = 9J
calculate 2kg of mass has a speed of 3m/s for KE (kinetic energy.
500
river and rain water fill up a lake behind a dam. as water rushes down through the dam it turns turbines which turns generators.
What is hydroelectric power scheme?
500
water is pumped down to hot rocks underground and rises as steam. in areas of volcanic activity the steam comes naturally from hot springs.