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# AQA GCSE Physics topic P3 (last exam June 2017)

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by

## Andy Darvill

on 18 June 2016

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#### Transcript of AQA GCSE Physics topic P3 (last exam June 2017)

AQA
GCSE Physics

Topic P3
Triple Science
Medical
Applications
of Physics
Using
Physics to
make things
work
Using
magnetic fields
to keep things
moving
X-rays
Ultrasound
Refractive Index
Endoscope
Lenses
Using
Lenses
The
Eye
the eye
Centre
of mass
Moments
Moments
in balance
Stability
Hydraulics
Circular
motion
Pendulum
Electromagnets
Motor
effect
Electromagnetic
induction
Transformers
Transformers
in action
Refractive index "n" of glass
is
how much light slows down
when it enters glass
n = speed of light in vacuum (or air)
speed of light in glass
n = sin
i

sin
r
http://www.darvill.clara.net/emag/emagxray.htm
http://www.bbc.co.uk/education/guides/zwjsgk7/revision/3
http://www.bbc.co.uk/education/guides/zttfyrd/revision/6
http://www.bbc.co.uk/education/guides/zttfyrd/revision/7
A see-saw will balance if the moments on each side of the pivot are equal. This is why you might have to adjust your position on a see-saw if you are a different weight from the person on the other end.

If a nut is difficult to undo with a short spanner, a longer spanner will help. This is because there will be a bigger moment on the nut, when the same force is applied further from the pivot.

Using the same principle you can increase the moment applied by a lever or a crowbar, and this can help you move heavy objects more easily.
http://www.bbc.co.uk/education/guides/z22v4wx/revision
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