OCR 21st Century Science A P1 P2 P3 Revision Notes

This is a word document containing notes given to me by a friend. They were quite useful for my revision in year 10 as they contain things which are relevant to the course.

They can also be used as flashcards if they are printed out.

Hope you find them helpful :)

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Science P1,2,3
Physics 1: The Earth in the Universe
Unit 1.1: Our solar system and the stars


Centre of our universe = Sun!
Every planet has a/many moons which orbits it.

Asteroids: Irregular lumps of rock.
Comets: Small objects made of ice…

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Apart from hydrogen, all the elements came from an explosion.

Galaxies appear to be moving away Redshift.
Redshift increases distance with Earth.

Universe started expanding approximately 14,000 million years ago.
Sun = 5000 million years ago
Earth = 4500 million years ago

Scientists believe in the Big Bang theory.

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Seafloor spreading:
The seafloor between continents move apart by a few metres each year

Oceanic ridges: form on expanding seafloor where liquid rock from the mantle fill the gaps.

The Earth's magnetic field changes over the years.

Unit 1.4: Tectonic plates and seismic waves

Tectonic plates:
The Earth's crust has…

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You can only see when your eyes absorb electromagnetic radiation called light.

Some objects emit light, while other reflect light.
Black objects absorb most light.
Shiny objects reflect most light.

Electromagnetic spectrum:


All waves transmit through a vacuum at 300,000 km/s.

Electromagnetic waves…

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You can increase the thermal energy transferred by increasing its exposure time and intensity.

Water molecules are good at transferring energy in microwaves to thermal energy.

Cells contain water so will heat up when they absorb microwaves.

Microwaves reflect off the metal in the walls and door or are absorbed…

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The small amount of carbon dioxide has an effect
Methane is a strong absorber of infrared radiation, but there is very little of it.

Scientists use computer models to predict the effects of global warming. The models are tested by seeing if
they can use past data to predict today's…

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Wind, waves and sunlight

Primary energy sources can transfer their energy to secondary energy sources, e.g. electricity.

The burning of fossil fuels is increasing the amount of carbon dioxide in the atmosphere.
The greenhouse effect is causing global warming, an increase in the temperature of the Earth's surface.
Global warming…

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1. Power stations use primary fuels, such as fossil, nuclear and biofuels, to boil water into steam.
2. The steam passes through a turbine, making its shaft spin round. The turbine shaft spins the magnet
3. Increasing the current drawn from the coil requires an increase in the rate…

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when there is wind.

Electricity is convenient because it can transfer energy over long distances for many uses.
The National Grid is a network of cables which carries electricity throughout the UK.

Increasing the voltage of a power cable reduces the current. The National Grid carried electricity at a very…



Please do this for the rest of the science topics!!


Thank you so so so so much made my exam revision easier

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not really a fan

because I don't blow air


I found 1 error "Centre of our universe = Sun!" but other than that it's really good.


do you have any other revision documents such as these?




i meant is good 




rlly gd

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