Physics P1, P2, P3 OCR 21st century

These are detailed revision notes which i have created for P1, P2 and P3 OCR 21st century.

All these notes follow the specification to make sure everything is covered!!

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Page 1

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P1 ­ The Earth in the Universe

P1.1 What do we know about the place of the Earth in the Universe?

The Earth is one of eight planets orbiting the sun in almost circular paths, together with other smaller
objects including asteroids, dwarf planets, comets and moons. The solar system…

Page 2

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Light travels at very high but FINITE (limited) speeds. This means that if the distance to an object is
great enough, the time taken for light to get there can be measured.

The speed of light is 300,000km/s in a vacuum.

Vast distances in space are measured in LIGHT YEARS.…

Page 3

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The sun's energy (heat and light) comes from NUCLEAR FUSION. Hydrogen nuclei fuse (join)
together to produce a nucleus with a larger mass, i.e. a new chemical element.

Hydrogen nucleus + Hydrogen nucleus Helium nuclei

During fusion, some of the energy trapped inside the hydrogen nuclei is released. All the…

Page 4

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Measuring the amount of mass in the Universe is very difficult, so it's ultimate fate.

P1.2 What do we know about the Earth and how it is changing?

Rocks provide evidence for changes in the Earth:

Erosion ­ the Earth's surface is made up of LAYERS of rock, one on…

Page 5

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Wegner also claimed that when two continents collided, they forced each other upwards to MAKE

Evidence For Evidence Against
The same types of fossilised animals and He was not a geologist and was therefore was
plants are found in South America and Africa considered as an outsider
The shape…

Page 6

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The Earth's crust, together with the upper region of the mantle, consists of huge blocks of rock

Volcanoes, mountains and earthquakes occur at the edges of tectonic plates ­ their creation
depends on the direction the plates are moving.

If the plates are MOVING APART, as at…

Page 7

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EARTHQUAKES produce wave motions on the surface and inside the Earth which can be detected by
instruments located on the Earth's surface.

There are two types of shock waves: P ­ waves and S ­ waves. Differences in the speed of P ­ and
S- waves can be used to…

Page 8

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The distance travelled by a wave can be worked out using the formula:

Distance (metres) = Wave speed (metres per second m/s) x Time (seconds)

All waves have several important features:

Amplitude ­ The maximum disturbance caused by a wave. It is measured by the distance
from a crest or…

Page 9

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P2 ­ Radiation and life

P2.1 What types of electromagnetic radiation are there? What happens when radiation hits an

White light can be split up into a spectrum of many different colours and visible light is just part of a
continuous spectrum of electromagnetic radiation.

Light is one of…

Page 10

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The energy arriving at a SQUARE METRE of surface per second is a useful measure of the strength
(or the INTENSITY) of a beam of electromagnetic radiation.

The INTENSITY depends on the number of photons delivered per second and the amount of
energy each individual packet, i.e. the photon energy.…


Danil Vekaria


If you have P4 P5 P6 notes as well that would be very helpful i am finding your notes prefect for my revison keep up the good work 



oh my god these are amazing.... you are amazing. Do you have any detailed notes like these on P4 P5 P6 and P7?    thank you for your amazing notes

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probably useful if I could read them.

can you do a brail version  



These notes have proved extremely helpful for me to revise from for my upcoming P1, P2 and P3 Physics Exam. Thank you very much for creating such detailed notes- definitely five stars!



This is really detailed and it is going to help me a lot. Thank you.

JoHnNy McInAlLy





i can't read it which is annoying



Anything on p4, 5, and 6? Would be ideal as we ave o do the extended course of study :( thanks!



Sfe g



Absolutely phenomenal

Nour Ghanem


Do you have any for P4,5,6?

Ali Mert


Thanks. Made My Life soo much easier



Bruv these notes am bare wet mek some gud uns and I can pas my exams you blud clat rude boy



Absolutely perfect :)

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