P3

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Ultrasound uses
Kidney stones, pre-natal scanning of foetus
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With magnifying glass object being magnified must be
closer to lens than principal focus
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You cannot
project a virtual image onto a screen
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powerful lens has a ____ focal length
shortage of workers temporarily slowed Polish economy. But was boosted by when emigrants sent back money. (£3bn in 2006)
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7 parts of the eye
Pupil, iris, lens, cornea, ciliary muscle, suspensory ligaments, retina
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Far point
farthest distance eye can see
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Near point
closest distance eye can focus on approximately 25cm
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As eye focuses on closer objects
power decreases, lens changes shape, and focal length decreases
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Finding centre of mass (4)
1) Suspend shape and plumb line from same point. 2) Draw line along plum line 3) Suspend from different pivot and do same. 4) Centre of mass is where they cross.
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Centre of mass
Point at which whole mass is concentrated
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Liquids are virtually
incompressible
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Since they can flow
a force applied at one point can be transmitted to other points.
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Pressure in liquid is
transmitted equally in all directions
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Magnetic field around current carrying wire
corkscrew rule
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coil of wire aka
solenoid
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electromagnets can be
turned on/off
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increase strength of magnetic field around solenoid by
adding soft iron core through middle of coil
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magnetically soft
magnetises/demagnetises very easily
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electromagnets can be used for
picking things up, some cranes, and dropping stuff down
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motor effect
lemmings RH rule
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2 factors speed up motor effect
more current stronger magnet
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split ring commutator
swapping polarity of DC to keep motor rotating in same direction by swapping contacts every half turn
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Define electromagnetic induction
Creation of P.D across conductor which experiencing change in magnetic field
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step up transformers
step voltage up : more turns on secondary than primary coil
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step down transformers
step voltage down : more turns on primary coil than secondary
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Stages of transofmrers
...
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1
primary coil produces magnetic field
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2
a.c produces changing magnetic field
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3
induces p.d across secondary coil, inducing ac in circuit attached to secondary coil
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switch mode transformers:
operate higher frequencies than traditional transformers and operate at 50-250kHz used as mobile/laptop chargers
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Other cards in this set

Card 2

Front

With magnifying glass object being magnified must be

Back

closer to lens than principal focus

Card 3

Front

You cannot

Back

Preview of the front of card 3

Card 4

Front

powerful lens has a ____ focal length

Back

Preview of the front of card 4

Card 5

Front

7 parts of the eye

Back

Preview of the front of card 5
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