P2 Forces & Elasticity OCR Gateway (9-1) 4.0 / 5 based on 1 rating ? Physicsforces and elasticityGCSEOCR Created by: AleenaCreated on: 06-04-18 17:16 What are the 2 types of Deformations? Deformations can be Elastic or Plastic 1 of 14 How can an object be deformed by a force? When an object is stretched,compressed or bent-when you apply forces on an object 2 of 14 What is the least number of forces needed to deform an object? two forces 3 of 14 What is an Elastic Deformation? When the object returns to its original shape after the forces are removed 4 of 14 What is a Plastic Deformation? When the object doesn't return to its original shape when you remove the forces 5 of 14 What is the equation to find the force exerted by a spring? Force exerted by a Spring (N) = Extension (m) x Spring Constant (N/m) 6 of 14 Can this equation be applied to all elastic objects,not just springs? yes 7 of 14 Is the Extension inversely proportional to the Force? no-they are directly proportional to eachother 8 of 14 What factor determines the spring constant of a spring? the spring constant depends on the material you're stretching-stiffer the material,larger the spring constant 9 of 14 What is Hooke's Law? The relationship between the extension of a spring & the force is called Hooke's Law 10 of 14 What is the elastic limit? The maximum force that can be applied to a material before it starts to deform plastically 11 of 14 What happens to a spring when you go beyond its elastic limit? It will deform plastically-no longer follows Hooke's Law 12 of 14 What are Plastic Materials? Materials that have a low elastic limit-you'll never normally see them deforming elastically 13 of 14 How might the graph of force by extension look like for Plastic Materials? it will non-linear=curved graph 14 of 14
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