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Questions and Answers
What is thermal energy?
The sum of kinetic and potential energy of the particles in an object.
Thermal energy increases as mass increases.
True
Temperature is a measure of the average potential energy of particles in an object.
False
What does heat (Q) refer to?
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Explain what happens when you hold a cold drink and your hand starts to feel ‘cold’.
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When heat flows into an object, the change in heat is ____.
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When heat flows out of an object, the change in heat is ____.
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What is conduction?
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What is convection?
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What is radiation?
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What are conductors?
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What are insulators?
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What is specific heat?
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The formula for heat change is Q = ____.
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What does the variable 'm' represent in the formula Q = mcΔT?
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What does the variable 'ΔT' represent in the formula Q = mcΔT?
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Study Notes
Thermal Energy
- Thermal energy is the total kinetic and potential energy of particles in an object.
- Thermal energy increases when mass increases.
- Thermal energy increases when temperature increases.
Temperature
- Temperature measures the average kinetic energy of particles in an object.
- Higher temperature means particles move faster.
Heat Transfer
- Thermal energy always flows from higher temperature objects to lower temperature objects.
- Heat (Q) is the transfer of energy from one object to another.
- Heat is measured in Joules.
- "Cold" is the absence of heat.
Example: Holding a Cold Drink
- When you hold a cold drink, heat flows from your hand (higher temperature) to the drink (lower temperature).
- This makes your hand feel cold because it is losing thermal energy.
Heat Flow
- When heat flows into an object, the change in heat is positive (+).
- When heat flows out of an object, the change in heat is negative (-).
Methods of Heat Transfer
-
Conduction: Transfer of heat through direct contact of particles.
- Solids are good conductors because particles are close together.
-
Convection: Transfer of heat by the movement of heated particles.
- Occurs in liquids and gases.
- Currents move heat from warmer to cooler areas.
-
Radiation: Transfer of heat through electromagnetic waves.
- Fastest in gases.
- Can be absorbed or reflected.
- Can travel through space and between molecules.
Conductors and Insulators
- Conductors: Materials that allow heat to flow easily.
- Insulators: Materials that do not allow heat to flow easily.
Specific Heat
- Specific heat is the amount of heat needed to raise the temperature of 1 kg of a material by 1 °C or 1 K.
- Different materials have different specific heats.
- Measured by a calorimeter.
Calculation of Heat Transfer
- Q = mcΔT
- Q = change in thermal energy (or heat) in Joules (J)
- m = mass in kilograms (kg)
- c = specific heat in Joules per kilogram per degree Celsius (J/kg °C)
- ΔT = change in temperature (°C) (T final - T initial)
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Description
Explore the concepts of thermal energy, temperature, and heat transfer in this quiz. Understand how thermal energy correlates with the mass and temperature of objects, and learn about the methods of heat transfer. Test your knowledge with practical examples, like holding a cold drink, to grasp these fundamental principles.
