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# A LEVEL PHYSICS WORK HELPPPP - Thermal Energy Transfer Physics watch

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1. Hi

I am just making my revision notes on thermal energy transfer and I am struggling to understand one of the spec points which is:

"Appreciation that during a change of state the potential energies of the particle ensemble are changing but not the kinetic energies. Calculations involving transfer of energy."
Why don't the kinetic energies change? Why do the potential energies change?

Any help would be appreciated.
2. Hi a simple way to understand the idea is that when the internal energy changes the object has either changed temperature (change in kinetic) or has changed state (potential).

The kinetic and potential energy dont change at the same time. For example, if ice was going to melt, first it would heat up; so only kinetic energy would increase; and when its reached the correct temperature it would change state to liquid; this is when the potential energy would increase but not the kinetic energy because it isn't changing in temperature anymore.

Hope that helped
3. thank you so much that makes so much sense now, i was getting really confused.
4. Does t
(Original post by Candlewood)
Hi a simple way to understand the idea is that when the internal energy changes the object has either changed temperature (change in kinetic) or has changed state (potential).

The kinetic and potential energy dont change at the same time. For example, if ice was going to melt, first it would heat up; so only kinetic energy would increase; and when its reached the correct temperature it would change state to liquid; this is when the potential energy would increase but not the kinetic energy because it isn't changing in temperature anymore.

Hope that helped
Does this apply to specific latent heat graph and concept?

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