Lesson Notes By Weeks and Term v4 - SHS 2
HEAT
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HEAT
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Subject: Physics
Class: SHS 2
Term: 1st Term
Week: 14
Grade code: 2.2.1.LI.3
Strand code: 2
Sub-strand code: 1
Content standard code: 2.2.1.CS.1
Indicator code: 2.2.1.LI.3
Theme: ENERGY
Subtheme: HEAT
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Welcome, future scientists and engineers! Today, we delve deeper into the concept of heat energy. We all know that on a hot day in Accra, a metal car door feels much hotter than a plastic water bottle, even though they are both under the same sun. Why is this? It's because different materials handle heat differently. Some, like water, can absorb a huge amount of heat without getting very hot, which is why a pot of soup takes so long to boil. Others, like the metal of the pot itself, heat up very quickly. This property is called Specific Heat Capacity.
This lesson is built on a few fundamental ideas. Let's break them down carefully. a) Heat vs. Temperature Heat (Q) is the total amount of thermal energy transferred from a hotter object to a colder object. It is a form of energy, measured in Joules (J). Temperature (θ or T) is a measure of the degree of hotness or coldness of a body. It indicates the average kinetic energy of the particles in a substance. It is measured in Degrees Celsius (°C) or Kelvin (K).
Think of it this way: a large bowl of warm water at 40°C has more *heat* energy than a small cup of boiling water at 100°C, because there are many more particles in the bowl, even though the cup's particles are moving faster (higher temperature). b) Specific Heat Capacity (c)
This is the core concept for today.
Definition: The specific heat capacity of a substance is the quantity of heat energy required to raise the temperature of a unit mass (1 kg) of that substance by one degree (1 K or 1 °C).