PPT-Aseel Samaro

Explaining floating and sinking The Greek physicist mathematician and inventor Archimedes had ideas that help us to understand floating sinking and buoyancy Even though he lived more than 2000 years ago his principles are still used today. Examining interacting muscles . There are commonly three things judges look for:. Symmetry . of the . muscles (how similar they are). Muscularity (how big they are). Level . of . conditioning (how toned they are. Investigating the effectiveness of . antacids . Introduction. Heartburn indigestion is caused by acid from the stomach irritating the upper digestive . tract.. For . those who suffer regularly, treatments are available to . Understanding how seeds are dispersed by the wind . The largest seed in the world is 50 cm in . diameter.. It . comes from the palm tree called Coco de . Mer. , found only in the Seychelles islands in the Indian . Calculating pressure. Calculating pressure is important to engineers.. For example, the foundations of a building have to carry the full downwards force of its weight.. There have been cases of buildings collapsing when the pressure on the foundations was too large.. Knowing how pollination leads to . fertilisation. . It is a pollen grain from a sunflower.. Pollen comes in a variety of shapes and sizes. The variety means that you might be allergic to one type but not another.. Exploring the importance of minerals to plants. All plants require essential elements that are not supplied by photosynthesis – minerals that are found in soil and absorbed by the plant through its root system.. Using Indicators . The traffic indicators on a car tell other vehicles when the car is going to . turn.. Indicators . in science can show us whether a substance is an acid or an . alkali.. Nature . is full of natural indicators and we can make use of these indicators in many ways.. Understanding electrostatic field. Charged objects can affect their surroundings even when they are not in contact.. Sometimes people believe that they can ‘feel’ electricity in the air. The idea of an electrostatic field helps to explain this.. Understanding anaerobic respiration. Plants and microbes, like animals, sometimes need to respire . anaerobically.. As . in animals, this process uses glucose to release energy. .. But . the products of anaerobic respiration in plants and microbes differ from the products in animals.. Changing . Physical state. When you make ice or melt the frost from a windscreen, you are making use of changes of . state.. What . is actually happening to the particles in these processes?. Introduction. Explaining static charge. In ancient Greece, people started to put forward ideas about atoms.. They thought that atoms were the most basic particles and that they could not be split further.. It was not until the 1800s that ideas really developed beyond this.. Exploring the role of stomata. Plants are found in a huge range of habitats.. In order to . photosynthesise. , plants need a supply of carbon dioxide.. How do plants get carbon dioxide? Why does oxygen, a product of photosynthesis, not build up in the leaf?. The heart is odd one out. The heart is made from cardiac muscle. The bicep muscle (in the arm), the calf muscles ( in the legs) and the diaphragm (in the chest) are types of skeletal muscles.. Investigating muscle strength . Symbols and simple diagrams can accurately represent an object, message or procedure, without requiring the skills of an artist.. Introduction. It is important to be able to represent how an . experiment.