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Why do boats float?
EduBook Organización
- 2927 visitas
If we make a little boat out of a walnut shell, we see that it floats and we relate this to the fact that the walnut shell is less dense than water. But what about real boats? Some of them are huge,…
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End-of-unit evaluation - Energy
EduBook Organización
- 2857 visitas
The Sun is the Earth's main energy source. The Sun provides plants and animals with light and heat. This means that they can grow, develop and live on Earth. Heat energy has other effects on…
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End-of-unit activities - Energy
EduBook Organización
- 2839 visitas
The Sun is the Earth's main energy source. The Sun provides plants and animals with light and heat. This means that they can grow, develop and live on Earth. Heat energy has other effects on…
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Introduction - Energy
EduBook Organización
- 2817 visitas
The Sun is the Earth's main energy source. The Sun provides plants and animals with light and heat. This means that they can grow, develop and live on Earth. Heat energy has other effects on…
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Self-assessment T10 02 - Machines and structures
EduBook Organización
- 2820 visitas
Complete these sentences with the correct words: Some objects become electrically when we rub one against the other. Electrical current is the flow of through materials. A is needed to create the…
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Reflection and refraction of light
EduBook Organización
- 2807 visitas
Objects reflect light When light shines on an object, sometimes it passes through the object and other times it reflects off it. When an object reflects light, we can see it. Mirrors A mirror is a…
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Unit 9: Motion and forces
EduBook Organización
- 2661 visitas
Accelerate (v): to go faster; to increase in velocity. apparent weight (n): the total sum of forces acting on a body. area (n): a quantity which expresses the extent of a twodimensional surface.…
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End-of-unit evaluation - Matter and materials
EduBook Organización
- 2553 visitas
Everything around us is made up of matter. Matter can be found in three states: solid, liquid and gas. The air we breathe is a gas, the water in rivers and seas is a liquid, and the rocks are in a solid…
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Complete. Dilation and contraction
EduBook Organización
- 2486 visitas
Complete the text with the correct words: heat contraction dilations mass temperature dilation material When objects heat up, the amount that they increase in temperature depends on three things, their…
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Summaries - Machines and structures
EduBook Organización
- 2478 visitas
1. Electrical current An object becomes electrically charged when it contains an electrical charge. Some objects become electrically charged when we rub one against the other. For example, when you rub…