a stone held up in the air can do work when dropped because gravity will pull it downwards.
100
What is gravitational potential energy? aka PE
a stone held up in the air can do work when dropped because gravity will pull it downwards.
100
what is a turbine?
this is a machine for generating energy.
100
name 3 types of fossil fuels
coal,oil and natural gas
200
what is the SI unit in joules?
joules is the SI unit for worck done.
200
what is work and energy measured in?
work and energy is measured in joules.
200
What is the formula for calculating PE? (gravitational potential energy)
gravitational potential energy= mgh
200
what is a genartor?
this is a machine wich converts energy from one from to anorther from.
200
What are bio-fuels?
these are fuels made from plant or animal matter.
300
what is elestic potential energy?
elestic potential energy is a streched rubber band can do work when realesed so can a compressed spring. so both have elestic potential energy.
300
what is the law of conservation?
energy cannot be made or destroyed but it can change from one form to anorther.
300
What is kinetic energy?
this is energy due to motion. all moving objects have kinetic energy.
300
name some thermal energy souces.
coal,oil and natural gas
300
What is solar energy?
solar panels absorb this energy and use it to heat water. solar cells are made from materials that can deliver an electric current.
400
express the following number in joules.
35mj x 100000=35000000
400
what is the law of conservation
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.
400
calculate when 2kg of mass is 3m above the ground and g is 10N.
potential energy= 2 x 3 x 10= 60
400
What is a tidal power scheme?
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.
400
What is tidal energy?
a lake fills when the tide comes in and empties when it goes out.
500
how much worck is done in a force of 12N moves an object in a distance of 5N?
w= f x d
12 x 5= 60J
w=60J
500
what is the height of of a 4kg ball wich has a energy of of 800f?
ep= m.g.h
800= 4.10.h
800/40=40/40
20=h.m
500
calculate a object wich moves at a speed of 4m/s
its kinetic energy is 128j whats its mass?
ek= 1/2 mv(2)
128= 1/2
8m= 128
m=16 kg
500
what happens if you transport fuels?
transporting fuels can cause pullotion. i.e there may be a leak from a oil tank.
500
What is geothermal energy?
water is pumped down to hot rocks underground and rises as steam. in areas of volcanic activity the steam comes naturally from hot springs.