# OCR Gateway Physics P5

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• Created by: charlotte
• Created on: 17-06-13 12:28
features of geo stationary orbit
satellites obit with the same period as the earth, 36000km above the equator, fixed position above the earth
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features of polar stationary orbit
satellites orbit around the poles while the earth spins allowing large areas of earth to be seen. orbital period is small
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speed of satellite orbit formula
circumference of cirlce / oribital period
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features of comets
non luminos lumps of rock/ice, very small, orbit the sun
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what is constructive interference? (same direction)
when the two waves meet and they interfere with each other, if they meet exactly in phase the amplitudes 'add up' to produce large crests & troughs
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what is destructive interference? (opposite directions)
when the two waves meet and interfere with each other and meet exactly out of phase, the amplitudes 'subtract' to produce no peaks or crests
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what is momentum?
a measure of how difficult it is to stop a moving object, the bigger an object is, the faster it moves
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conservation of momentum
if 2 objects collide or interact the forces acting on each one will be the same size in opposite directions, meaning the momentum lost by one object will be gained by the other.
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uses of satellites
monitoring weather & climate, communications, navigation
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how does orbit work (centripetal force)
if an object is travelling in a circle it's constantly changing direction, the orbit is a balance between the forwards motion and the force pulling inwards (centripetal force)
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how to calculate vectors
with or agains current: draw the vectors end to end. across the current: draw a triangle, for speed use pythagoras, for direction, trigonometry
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projectile motion features
horizontal velocity is constant, vertical velocity steadily increases
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the longer the wavelength..
the more it will diffract
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how to get the maximum amount of diffraction
size of gap = wavelength
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what is refraction?
when a wave enters a different medium it changes direction due to a change in speed causing wavelength to change
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why are different colours refracted different amounts
they travel at different speeds
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## Other cards in this set

### Card 2

#### Front

features of polar stationary orbit

#### Back

satellites orbit around the poles while the earth spins allowing large areas of earth to be seen. orbital period is small

### Card 3

#### Front

speed of satellite orbit formula

### Card 4

#### Front

features of comets

### Card 5

#### Front

what is constructive interference? (same direction)