Energy
foundation physics book - needs the book to do these questions
Help files
Revision resources
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Energy |
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foundation physics book - needs the book to do these questions |
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Help files |
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Revision resources |
| student work on insulation |
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Energy
OCR syllabus |
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explain how the turning effect of a force depends on the
size of the force and the perpendicular distance from the point of
application to the pivot. |
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state and be able to use the equation moment of a force =
force x perpendicular distance to pivot.
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use, for a balanced system, the equation sum of clockwise
moments = sum of anticlockwise moments. |
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state and be able to use the equation work done = force x
distance moved in its own direction. Work
done (Joules) = Force (Newtons) x distance (metres) |
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use the equation power = work done (or energy transfer) /
time taken. power (watts) =
energy (Joules) / time (seconds) |
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state and be able to use the equation change in
gravitational potential energy= mass x gravitational field strength x
height moved. gpe (Joules) = mass (kg) x g (approx N/kg) x height (m) |
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state and be able to use the equation kinetic energy = /mv^
. KE (joules) = / mass (kg) x
velocity (m/s) squared |
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state and be able to use the equation energy transferred =
work done. |
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use the equation energy efficiency = useful energy output /
total energy input |
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explain the meaning of energy efficiency in the contexts of
heating buildings and the performance of machines. . |
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describe how domestic insulation reduces energy transfer by
conduction, convection and radiation. |
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use data on energy efficiency measures to evaluate
cost-effectiveness of different approaches. |