Lesson Notes By Weeks and Term v4 - JHS 3

ENERGY

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  4. ENERGY

Subject: Science

Class: JHS 3

Term: 2nd Term

Week: 8

Grade code: B9.4.1.2.4

Strand code: 4

Sub-strand code: 1

Content standard code: B9.4.1.2

Indicator code: B9.4.1.2.4

Theme: FORCES AND ENERGY

Subtheme: ENERGY

Lesson Video

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Performance objectives

Lesson summary

An eclipse is a natural event that happens when one space object blocks light from the Sun and casts a shadow on another object. Even though eclipses are not everyday events in Ghana, understanding them helps learners to: explain day–night light and shadow using science, avoid dangerous myths and practise safe viewing, connect Science to energy (light energy from the Sun), and use simple models and digital resources to learn (NaCCA CI & DL).

Lesson notes

A. Link to ENERGY (Very Important) The Sun is a major source of light energy (and heat energy) for Earth. Light travels in straight lines. When an object blocks light, it forms a shadow. An eclipse is basically a large-scale shadow event in space. B. Meaning of Eclipse Eclipse: An event in which the light from the Sun is blocked, causing one celestial body to move into the shadow of another.

There are two main types: Solar eclipse (Sun’s light to Earth is blocked) Lunar eclipse (Moon moves into Earth’s shadow) C. Shadows in Eclipses When light is blocked, two main shadow regions form: Umbra The darkest part of the shadow Light is completely blocked If you are in the umbra during a solar eclipse, you see a total solar eclipse. Penumbra The lighter outer part of the shadow Light is partly blocked If you are in the penumbra, you see a partial solar eclipse. D. Solar Eclipse (Moon blocks Sun’s light to Earth) Alignment: Sun → Moon → Earth

What happens? The Moon comes between the Sun and Earth. The Moon blocks some of the Sun’s light energy from reaching Earth. The Moon’s shadow falls on a small part of Earth.

Types (basic): Total solar eclipse: observer on Earth is in the Moon’s umbra. Partial solar eclipse: observer is in the Moon’s penumbra.

Evaluation guide