I have never really written much about pressure on the blog. Perhaps it has always seemed a little dull but questions do come up about pressure so I ought to have a go. It ties in nicely with the posts about forces because pressure is force applied per square centimetre. At C.E. pressure will always …
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Category:Revision
Words, Words, Words (Phys. Ed.)…
Some physics words with links to relevant Twig World videos. You will need to be logged into your Twig World account to be able to view the videos but you only need to log in once then you should be fine. Force – a force is a push or a pull gravity/weight – the force …
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Words, Words, Words (Chem. Ed.)…
I thought it might be good to have a page with definitions for some commonly used words in science. This post will be largely chemistry based; I have done biology and physics versions too. I apologise in advance if it is too simple for you – just make sure that you really do understand each …
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Words, Words, Words (Bio. Ed.)…
More definitions and links to Twig Prep videos as a companion to Words (Chem. Ed.) Respiration – whilst dictionaries and encyclopaedia will define this as ‘supplying the cells with oxygen’ we always use it in the sense of “the process within all living cells that releases energy from food molecules (usually glucose)” aerobic – aerobic …
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Food Groups…
Apologies – this has ended up being a long read. Don’t feel you have to do it all in one. I will post separate pieces on much of this in the future. This might be a useful page to refer back to in the future. Graphics like this annoy me slightly. The information is good …
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Force & Linear Motion…
Time, Distance & Speed The average speed of a moving object is the distance it travels divided by the time it takes. At CE, this will usually be calculated in metres per second (m/s). The equation to use is… speed = distance ÷ time (or s=d/t) You may also need to calculate distance or time, …
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Density…
This picture neatly captures the idea of liquids having different densities. The lowest density liquid floats on the top and all the other layers stay as they are because of their relative densities. This must have been done very carefully because some of these liquids will mix with one another (miscible). Immiscible liquids will not …
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Forces v Energy (Part I)…
A thing that often causes a little confusion is the distinction between energy (the capacity to do work – measured in joule) and forces (which are simply pushes or pulls – measured in Newton). It is very important to read exam questions very carefully to avoid using the wrong one. Energy There are three forms …
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Forces v Energy (Part II)…
The next thrilling instalment in the ‘Forces v Energy‘ series – who will win? Well, neither because they are totally different things so they cannot have any sort of competition or conflict. It would be like saying ‘Custard v Empathy’ – which will win? Forces Forces are measured in Newton. Forces cause objects to speed …
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A Specialised Animal Cell…
Eukaryotic cells contain organelles like a nucleus or mitochondria. Prokaryotic cells include things like bacteria that do not have separate structures within them – that is why they are so much smaller. Signals are carried around the body by nerve cells (more properly known as neurones or neurons). The myelin sheath accelerates the impulse (the …
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