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Light

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Light

  • Date December 3, 2020
Science Skills – Grade 6 Light

Light rays are reflected from an object to our eyes.

  • Light travels in a straight line in waves of energy from the source.

  • It travels at a speed of 300,000 km per second through air.

  • Light is either reflected, transmitted or absorbed.

http://localhost/dca/wp-content/uploads/2016/07/Reflection-and-Refraction-of-light-Introduction-for-kids.mp4

 


Objects we classify as –

a. Transparent – allows all light to pass.

b. Translucent – blocks some light and scatter some in all directions

c. opaque – blocks light and reflects a shadow

  • Natural light sources or objects that produce light are called luminous. eg. Sun, candle, match stick.

  • Objects which reflect light are called illuminated things.

Where does the moon gets it light from?

The moon gets its light from the sun. It does not produce light.

The moon is an illuminated object.

Stars – luminous

Sun – luminous

Moon – illuminated

Lamp – luminous

Earth – illuminated

Shadow – formed when an opaque object blocks all light.

Reflection – the bouncing back of light from the surface of objects. Some materials reflect light very well are called good reflection. Eg. A piece of glass when light rays hit the surface, a smooth surface such as a glass or mirror, it is reflected evenly in straight lines in one direction. However, when light hits a rough surface, light is reflected in a dis- orderly or random way and scattered in all directions.

Refraction – the bending of light rays as light rays pass from one medium to another eg. Air into water, they bend.

This bending is called refraction. Image result for refraction images

This happens because light travels at different speeds. Light travels fastest in air and slower in liquids and slowest in solids. The angle at which light enters the water causes the light rays to bend and so the straw appears bent.

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TERM 1 UNIT 1: THE ENVIRONMENT18 In this Unit, students will learn about climate change, its effects and ways of stemming it. They will explore the nature of solid waste pollution, and identify ways in which this problem can be alleviated. In addition, they will study the causes of soil degradation, the methods of preventing soil degradation, and appreciate the importance of caring for the environment.
The Environment
Ecosystems and Biomes
HomeWork – Ecosystems – September 15, 2020
Conservation – Caring for the environment
Human Activities and their effects on the environment
Review Questions – September 24, 2020
Environmental problems – Climate Change
The Greenhouse Effect
Solid Waste Management
Let’s reduce solid waste
Soil Degradation
Soil Eroision
Homework – October 9, 2020
Man-made causes of soil erosion and how we can prevent it
Soil Types
Science project 1
Science Project 2
Science Project 3
TERM 1 UNIT 2: LIGHT AND SOUND7 In this unit, students will investigate the nature of light and sound energy, and how they interact with various materials. They will identify sources of noise pollution, note the harmful effects on humans and be aware of mitigation strategies.
Light
Homework – Review of Light
TERM 2 UNIT 2: HUMAN BODY SYSTEMS3 In this Unit, students will learn about selected human body systems. Through observations, demonstration and research they will identify the organs associated with each system and state their functions. Range of Content • The main structures and functions of selected human body systems  Circulatory system (Heart, blood, blood vessels). The main job of the circulatory system is the transporting materials throughout the body. It carries nutrients, oxygen and water to different parts of the body and removes waste.  Digestive system (mouth, oesophagus, stomach, small intestine, large intestine). The digestive system helps to break down food into a form that the body can find useful.  Excretory system (kidney, bladder, skin, lungs). Substances that may be harmful to the body are removed through the excretory system.  Nervous system (brain, spinal cord, nerves). The nervous system controls the body's actions.  Reproductive system (penis, testes, vagina, ovary, uterus/womb). The reproductive system is responsible for producing offspring.  Respiratory system (nose, trachea, lungs). The respiratory system produces energy from food.  Skeletal and muscular systems (muscles, bones, joints). The muscular and skeletal systems work together to help the body to move. The skeletal system also protects major organs throughout the body.
Light – Reflection Refraction and Absorption
Mirrors
Sound
Review of Light – Quiz – November 20, 2020
Review of sound – December 2, 2020
TERM 2 UNIT 1: MATERIALS PROPERTIES AND USES1 In this unit, students continue to learn about the names, properties and uses of everyday materials begun at the lower grades, are clear about safety at all times, and recognise that materials are handled, stored and disposed of in different ways depending on their properties. Students will plan investigations; including controlling variables where appropriate e.g. fair tests. Students will differentiate between reversible and irreversible changes. They will evaluate, through investigations, whether or not particular changes are reversible. They will assess the usefulness of some reversible and irreversible changes in everyday situations.
Properties and use of selected materials
TERM 2 UNIT 3: MIXTURES1 In this unit, students will learn that substances can be combined to form mixtures. They will classify mixtures according to their properties. They will learn to work cooperatively and develop problem solving skills as they investigate specific methods of separating mixtures. Range of Content • Substances combine to form mixtures • Types of mixtures include solutions, suspensions, and colloids • Mixtures can be physically separated based on size of particles, magnetic properties and how readily they dissolve • Methods of separating mixtures include filtration, evaporation, sieving, and decanting
Digestive System
The Circulatory or CardioVascular System
Respiratory System
Classifying Mixtures
TERM 3 LESSON 1 _ NUTRITION AND DRUGS
April 28, 2020
TERM 3 LESSON 2 - APRIL 29, 2020
Class Activity – Drugs and Awareness – April 29, 2020
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