Second Term Lesson Note for Week One
Class : SSS 1
Subject : Physics
Topic : Heat Energy
Duration : 40 Minutes
Period : Single Period
Reference Book :
New School Physics for Senior Secondary School.
Lagos State Unified schemes of work for Senior Secondary School.
Online Resources
Instructional Material : Chart showing the concept of heat energy.
Learning Objectives : By the end of the lesson learners will be able to :
i. Explain Heat Energy
ii. Define Heat and Temperature
iii. Identify the effects of heat
Content :
Concept of Heat
Temperature
Effect of Heat on bodies.
Concept of Heat
Heat is a concept of physics that deals with the study of relative motion of fluid (liquid and gas) from one body to another. It is a form of energy that can be transferred from one body due to temperature differences.
Temperature
Temperature is the degree of hotness and coldness of a body or an object. It is a scalar quantity, measured in Kelvin. Heat and Temperature are similar but not the same
Differences between Heat and Temperature
1. Heat is a measure of the total internal energy of a body while temperature is the degree of hotness or coldness of the body.
2. Heat takes place due to temperature difference while temperature occurs due to slight change of substance.
3. Heat is measured in joules while temperature is measured in Kelvin / Celsius.
Effect of Heat
When heat is applied to a body the following effect may occur
- Expansion : when heat is applied, volumes increases while density decreases.
- Change in temperature : When heat is added on a body, the temperature increases
- Change of state : melting, freezing, condensation, evaporation etc.
- Thermion emission: Addition of heat on metal may result in the emission of electron from the surface of the metal
Photo electric emission: The emission of electron when sufficient light of high frequency is illuminated on a metal surface e.g. zinc plate.
Presentation Steps :
Step 1 : The teacher revises the previous terms work with the learners by asking questions orally.
Step 2 : Introduces the new topic by explaining the concept of heat energy.
Step 3 : Asks the learners to differentiate between heat and temperature.
Step 4 : State the effects of heat on substances.
EVALUATION
1. Define Heat Energy
2. What is temperature?
3. Differentiate between heat and temperature.
4. Mention five effects of heat
Conclusion : At the end of the lesson learners were able to answer the questions correctly.
ASSIGNMENT
1. Which of the following is not an effect of heat? A. expansion B. contraction
C. change of state. D. increase in weight
2. Temperature can be measured in the following units except _______ (a) Degree Celsius (b) Kelvin (c) Degree Fahrenheit (d) Centigrade-meter
3. When heat is extracted from water it changes from liquid to gas. What is this process called _____________? (a) Condensation (b) Evaporation (c) Sublimation
4. The process of by which a gas is converted to a solid is called ____________
5. Fahrenheit is a unit of ______________
6. Heat is measured in ___________. (a) Joules (b) Kelvin (c) Metre
7. Temperature is a _________ quantity. (a) Scalar (b) Vector (c) Fluid