IGCSE – Physics- 0625
Thermal physics
Part 2
6/21/2020
IGCSE - Physics - Thermal Physics - Manal
Mousa
1
6/21/2020
IGCSE - Physics - Thermal Physics - Manal Mousa
2
6/23/2020
IGCSE - Physics - Thermal Physics - Manal
Mousa
3
6/21/2020
IGCSE - Physics - Thermal Physics - Manal
Mousa
4
Thermal energy or internal energy
6/21/2020
IGCSE - Physics - Thermal Physics - Manal
Mousa
5
Internal (thermal)energy +Temperature
+ Heat
• Internal Energy
• When a substance is heated, its internal or thermal energy
increases.
• As a substance’s internal energy increases, so will its temperature.
The higher the temperature of a substance, the more internal
energy it have.
As the temperature of a substance is
increased, the total energy of the
molecules (the internal energy)
increases
6/21/2020
IGCSE - Physics - Thermal Physics - Manal Mousa
6
6/21/2020
IGCSE - Physics - Thermal Physics - Manal
Mousa
7
6/21/2020
IGCSE - Physics - Thermal Physics - Manal Mousa
8
6/21/2020
IGCSE - Physics - Thermal Physics - Manal
Mousa
9
6/21/2020
IGCSE - Physics - Thermal Physics - Manal
Mousa
10
6/21/2020
IGCSE - Physics - Thermal Physics - Manal
Mousa
11
Internal Energy (thermal energy)&
Molecules
• The molecules within a substance possess two forms
of energy:
– Kinetic energy (due to their random motion/vibration).
– Potential energy (due to the bonds between the molecules).
• Together, these two forms of energy make up the
internal (thermal) energy of the substance.
• When a substance is heated, that heat will usually
cause the kinetic energy of the molecules to increase.
• The temperature of the material is related to the
average kinetic energy of the molecules.
6/21/2020
IGCSE - Physics - Thermal Physics - Manal
Mousa
12
6/21/2020
IGCSE - Physics - Thermal Physics - Manal
Mousa
13
6/21/2020
IGCSE - Physics - Thermal Physics - Manal
Mousa
14
Question
6/21/2020
IGCSE - Physics - Thermal Physics - Manal
Mousa
15
Answer
• The temperature and internal energy are
directly proportional. A decrease in the
temperature will result in a proportional
decrease in the internal energy
• The temperature decrease 10C÷20C = 0.5
6/21/2020
IGCSE - Physics - Thermal Physics - Manal
Mousa
16
6/21/2020
IGCSE - Physics - Thermal Physics - Manal
Mousa
17
6/21/2020
IGCSE - Physics - Thermal Physics - Manal
Mousa
18
6/21/2020
IGCSE - Physics - Thermal Physics - Manal
Mousa
19
6/21/2020
IGCSE - Physics - Thermal Physics - Manal
Mousa
20
6/21/2020
IGCSE - Physics - Thermal Physics - Manal
Mousa
21
6/21/2020
IGCSE - Physics - Thermal Physics - Manal
Mousa
22
6/21/2020
IGCSE - Physics - Thermal Physics - Manal
Mousa
23
6/21/2020
IGCSE - Physics - Thermal Physics - Manal
Mousa
24