Physics P5
- Created by: Mollie Derhun
- Created on: 30-04-13 20:10
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- P5 - Space for Reflection
- Satellites and Gravity
- Geo satellites = 24h orbit above equator
- Gravitational force keeps a satellite in orbit
- The height and perdiod of a satellite depends on its job
- Centripetal force is a force towards a center of a circle to maintain circular path
- Satellite communication
- Some radio waves are reflected by the ionosphere
- High frequency waves pass through to reach an orbiting satellite
- Long wavelength waves are easily diffracted around hills
- amount of diffraction depends on size of gap
- Scalars and Vectors
- Scalar quantity = size only, vector quantity = size and direction
- momentum = mass x velocity
- changes in temp and volume = changes in pressure
- projectiles have a constant horizontal velocity
- Waves
- polarised light has oscillations in one plane only
- convex lens makes a beam of light converge
- type of interference depends on path difference
- total internal reflection = light goes from a dense to less dense medium
- Satellites and Gravity
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