same

same

Hi Mark. Thanks for the message. You can get me at targetingthetop@gmail.com. Once you've read this, please reply so I can delete this post! Thanks, Nathan

@@fiveminutephysics you forgot to delete it

Hi Mrs Hughes' class!

A good question. This is not what was taught in the previous GCSE specifications, so lots of non-specialist eg. biology science teachers aren't teaching this to their classes - they're just teaching what they always did. However, this is what the new specification describes - check for yourself. I am a specialist physics teacher, and have been to two training sessions on this topic - precisely because it is now being examined differently - and one of these was by the Institute of Physics examination link officer. So I'm fairly confident is is 'right' so far as GCSE physics goes.

i think there might might be some mistakes in the transaction like the way it passed on but overall right it is one of the best anologies I have ever heard

@@cyrilfelicio1384 Thanks. When you've got a Physics degree, you can come back and tell me what the mistakes are!

@@fiveminutephysics dude stfu he was just trying to help.

Yes, just those 8. Electrical falls under electrostatic (in that there is a moving charge) and internal falls under thermal. You could argue that that's not technically correct but you never get to know the whole story at GCSE!

Thank you, do the examiners accept either term? Also, is it like how voltage and potential difference is the same but not exactly the same?

It's best to play safe and use the key terms in the revision guide. The examiners will go by the mark scheme, which may say 'accept electrical'. for example in the notes but you can't know for sure that it will say that.

And yes, it is similar to the way that voltage and potential difference are not synonyms but there are circumstances where using either is accurate, since voltage is very general.

According to this model of energy yes, the pathways are the only way energy can be moved between stores. So in the catapult example a force is applied, so this is the mechanical pathway, moving energy from the elastic store (catapult) to the kinetic store (ball).

@@fiveminutephysics I think I understand now. Thank you, I'd really appreciate it if you could answer me one final question related to energy stores, between kinetic energy stores and thermal energy stores, when talking about paticle motion in gases, when you increase the temprature of a gas via heating, is energy transfered to the thermal energy store of the gas which hence is then transfered into the kinetic energy store of the particles or is it directly transfered to the kinetic energy store of the gas? The reason i ask this is because within conduction and more importantly convection, the text book clearly states that when heating a system or gas, the energy is transfered to the thermal energy store of the gas/ object. Which is then shared between the kinetic energy store of the particles, however when talking about pressure increasing/decreasing no where does it state within the textbook that energy is transfered to the thermal energy store of the gas, but instead when heated up, energy is directly transfered to the kinetic energy store of the particles.

@@Hello-tj3nn You are thinking about this properly - well done. There is a problem here... the 'energy stores' model is just that - a model, which helps to understand what's happening. However... it's not perfect - and when you look too closely, you spot the problems - which you've done. The truth is, whenever we talk about the 'thermal energy store' of something, we actually mean kinetic energy of the particles - which are vibrating on the spot in a solid, or moving randomly in a fluid. There is no such thing as thermal energy - we just talk about the thermal store to distinguish these vibrations (solid) or random movements (fluid) from translational movement, where something has kinetic energy and there is a net movement - ie. it moves from A to B. If you look at one particle in a gas, it gains energy and moves faster - more energy in the kinetic store. If you look at the gas as a whole it isn't moving, as for every particle moving upwards, another will, on average be moving down etc. To explain pressure, you need to think about the motion of individual particles and their collisions with the container - and therefore their random motion suddenly becomes important - hence the textbook jumps to talking about energy in their kinetic store, not the thermal one. I hope that makes sense? Basically the thermal store = the kinetic store of particles if you look closely enough at any situation (but it's often convenient to separate them into two stores.)

@@fiveminutephysics thank you for all the help, i think it makes sense, im not sure if ive understood this right but effectivly are you saying thermal energy is just another way we distinguish whats going on? So for instance if were talking about an electrical device when energy is transfered electrically, energy as well as being transfered usefully is also dissipated -when this energy is dissipated - it is transfered to the thermal energy store of the particles, which is why the surroundings heat up, to be more specific through conduction, but i think what you're saying is its convinent, in this example, to separate them into two stores so the concept within conduction and convection is easier to understand, but for examples like increasing the temprature of the gas will increase the pressure of the gas. Energy being transferred to the 'thermal energy store' via heating is irrelavent in this case which is why the book skipped the step out; the step does not need to be identified, as there are no vibrations or random movements that need to be observed. Please correct me if i've misunderstood, thanks. Also commenting on another thing you said thermal energy doesn't exist and technically its just the kinetic energy of the particles producing heat, how does that happen, is it when the particles collide and energy is released as heat?

@@Hello-tj3nn When something gains energy in its thermal store, its particles vibrate or move faster. If, as you say, that movement isn't important - we just call it energy in the thermal store. If that movement causes something else - like an increase in pressure, then we look more closely, taking account of the particles' movement.

Hello science set 1!

الخوف محفز قوي

Your just stupid

that's why it says five 'ish' minutes, please do not be so rude.