Required Practical: The Young Modulus Aims of the Experiment The aim of the experiment is to measure the Young Modulus of a metal in the form of a wire This requires a clamped horizontal wir...
The Young Modulus The Young modulus is the measure of the ability of a material to withstand changes in length with an added load This gives information about the stiffness of a material Thi...
Conservation of Energy in Deformation Loading and Unloading a Metal Wire When a metal wire is loaded with a force and stretched beyond its limit of proportionality, it will undergo plastic d...
Plastic Behaviour Materials can undergo two types of deformations: Elastic deformation When the load is removed, the object will return to its original shape This is shown in the elastic reg...
Elastic Strain Energy Work has to be done to stretch a material Before a material reaches its elastic limit (whilst it obeys Hooke's Law), all the work is done is stored as elastic strain energy Th...
Edexcel IGCSE Biology 复习笔记 2.10.6 The Human Nervous System The Human Nervous System: Structure The human nervous system consists of: Central nervous system (CNS) – the brain and spinal c...
Tensile Stress & Strain Opposite forces can deform an object If the forces stretch the object, then they are tensile forces Tensile forces lead to the two properties of materials known a...
Edexcel IGCSE Biology 复习笔记 2.10.5 Co-ordination Systems in Humans The Human Nervous System & Endocrine System There are two different control systems in humans that work together to ...
Edexcel IGCSE Biology 复习笔记 2.10.4 The Role of Auxin in Phototropism The Role of Auxin in Phototropism Plants produce plant growth regulators (similar to hormones in animals) called auxin...
