# P1A REVISION NOTES

SINGLE SCIENCE, OCR BOARD - HIGHER TIER, PHYSICS - P1A

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### Page 1

Heat and Temperature

Heat is a form of energy
The hotter a substance, the more kinetic energy it has
In a solid the particles vibrate more, in a liquid they move
about faster and in a a gas they whizz about even faster

### Page 2

Heat energy will always flow from an area with high
energy to an area of low energy area
The bigger the temperature difference the faster the
flow
Cool objects in warm place take in energy from
surroundings
Warm objects in cooler surroundings lose energy

Heat and Temperature

Heat is a…

### Page 3

An infra ­ red camera can produce a thermo gram to show
hot and cold spots, as different colors

Specific heat capacity

This is a measure of how much heat a substance can hold
When you heat food you have to heat he pan first before
any energy is transferred…

### Page 4

C is the specific latent heat
M is the mass of the object
T is the temperature

Change of State

Energy is required to overcome the forces of attraction
between particles when changing state
The amount of energy is required to change state is called
the specific latent heat and…

### Page 5

Example of E = Ml

How much chocolate is needed to malt a 500 g bar of
chocolate, ( the specific latent heat of chocolate is 250,000 J
/ Kg ) ?

E = mL
= 0.5 X 250,000
= 125,000 J
= 125 KJ

### Page 6

The line on the graph levels out whilst the chocolate is melting
because the energy is being used to break the attractive forces
between particles