Have you ever wondered why golf balls have dimples?

If yes, I must ask what is wrong with you. (YOU VERY SAD PERSON)

Anyhow, now I've asked the question, I feel obliged to give an answer.

What it boils down to is the two different types of airflow; laminar and turbulent. Laminar flow is characterised  by a system of orderly layers, with no eddies or irregular fluctuations. In simpler terms, the flow lines do not cross.
Turbulent flow then is where there is not a system of orderly layers; that the flow lines cross.

Laminar flow past a ball is bad; it forces a larger separation in the air flows, causing greater drag, so that the ball will not travel very well. However, the balls dimples cause the flow lines to cross, and creates a turbulent stream behind the ball, lessening drag.

Really, all I needed to say was that golf balls with dimples travel further... But that would have been no fun.

Without force, I can still move...

Just not start or stop, in other words accelerate. I'd be going on and on forever at a constant velocity. Luckily there's forces such as friction to stop me doing this - otherwise we'd be able to create perpetual motion. However, it is interesting (or at least I think so,) that I can still move at a constant velocity without a resultant force. It is only when forces are unbalanced, (skewed in one direction) that I will accelerate, either with a positive or negative magnitude. This is the essence of Newton's first law.

His second law covers this too, with the simple equation F= ma (Resultant force = mass x acceleration)

If my F= 0, it is clear to see that I will not accelerate.

What I think is more important about this second law is that it links acceleration to mass, and thus gives mass (a very hard concept to explain) a definition (though there are several); the measure of an objects resistance to acceleration.

Why I Like Moles

I like moles. Not the furry little critters, but 6.02x10^23. An amount.

Carbon's relative atomic mass is 12. 1 mole of Carbon weighs 12 grams. Mind blown? I think so.

Pity the chemistry kind don't have cute noses...

Moles are useful because they enable us to work out amounts of elements used in reactions, as long as we know the relative atomic mass of the elements or molecule. This is relatively simple to do so, and is hence why I like them; easy marks in tests!