Q1
Which direction does heat flow?
AFrom hotter to colder objects
BFrom colder to hotter objects
CIt doesn't flow
DRandomly in any direction
ICSEClass 9 (ICSE)PhysicsCh 6 · Topic 2
Practice and Revision - Heat and Energy
Let us practise and revise what we learned about heat and energy. Heat is a form of energy transfer between objects at different temperature
Core concept
Heat flows from hotter to colder objects until they reach the same temperature (thermal equilibrium), a fundamental principle of thermodynamics.
How it works
Specific heat capacity measures how much heat energy is needed to raise a substance's temperature, varying between different materials.
Why it matters
Heat causes thermal expansion in most materials, where substances expand when heated and contract when cooled.
Key detail
Understanding heat and energy transfer explains everyday phenomena, like why metal feels colder than wood at the same temperature, or how thermometers work.
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Quick notes
• Heat flows from hotter to colder objects.
• This continues until thermal equilibrium.
• Specific heat capacity varies by material.
• It measures heat needed to raise temperature.
• Heat causes thermal expansion.
• Substances expand when heated, contract when cooled.
• This explains why metal feels colder than wood.
• It also explains how thermometers work.