Hooke law and young modulus a-level physics pdf

This slideshow covers the following content of the 2015 edexcel a level physics course. Pearson edexcel centre number candidate number level 3 gce. The physics is put into context by linking the properties of materials to their uses in engineering, construction, medical sciences and the manufacture of. Youngs modulus is a measure of the ability of a material to withstand changes in length under lengthwise tension or compression. The elastic limit of a material is the furthest point it can be stretched or deformed while being able to. Hookes law states that for a material within its elastic limit, the force. The basic idea behind hookes law is that the change in length of a stretching. Hooke s law states that the extensionx of a spiral spring. Unlock the full alevel physics course at created by elisavet, physics expert at snaprevise. The young modulus of a material is defined as the ratio of stress to strain. Peckham physics 307 fall 1983 digitized and revised, fall 2005 abstract the spring constant of a screendoor spring was determined both statically, by measuring its elongation when subjected to loading, and dynamically, by measuring the period of a mass hung from one end and set into vertical oscillation. Materials that obey hookes law are called hookean materials. For instance, the spring is pulled downwards with either no load, f p, or twice f p. Youngs modulus physics revision gcse and a level physics.

I put it in the article so that people would be aware that there is an inconsistency if requiring the information. Physclips provides multimedia education in introductory physics mechanics at different levels. On a stressstrain graph the young s modulus is constant for the portion of the graph where hooke s law applies. To determine the spring constant, oliver, a year 12 pupil, measured the distance that one side of the rubber extended, when various. In position b a force f is used to compress the spring by a length equal to. If a wire of length l and radius r be loaded by a weight mg and if l is the extension produced, then, normal stress 1 and. Ocr as and a level physics a delivery guide understanding.

Modules may be used by teachers, while students may use the whole package for self instruction or for reference. Young modulus data table, inconsistency i have added alternative e for polyethylene terephthalate from its wiki page. Nov 04, 2011 powerpoint and worksheet on hookes law that i use for as ocr physics. Young s modulus, also known as the elastic modulus, is a measure of the stiffness of a solid material.

Hookes law forces and elasticity aqa gcse combined. If youre seeing this message, it means were having trouble loading external resources on our website. The basic idea behind hookes law is that the change in. Youngs modulus for zero strain, and therefore an absolute constant. A string has a diameter of 1 cm and the original length of 2 m. If one end of the spring is fixed, this force will act over a certain distance and so will perform work. In position a the spring is at rest and no external force acts on the block. Youngs modulus measures the resistance of a material to elastic deformation. After exploring hooke s law and answering a series of application questions, students apply their new understanding to explore a tissue of known surface area. Finally we will cover a young s modulus 2 shear modulus 3 bulk modulus. Hookes law in terms of a loaddisplacement and b stressstrain. A description of hookes law, the concepts of stress and strain, youngs modulus stress divided by strain and energy stored in a stretched material.

For me, what makes this software stand out is that it really makes the user think about what they are doing, rather than just blindly pressing buttons. National 5 assignment nat hookes law a mrs physics. Hookes law states that within the limit of elasticity, stress applied is directly proportional to strain produced. The reference wire and test wire are hung from the ceiling. The oscillations of a cantilever are determined by its youngs modulus. Hookes law in my opinion rests entirely upon experiment, nor does it seem to me. Module 1 practical skills in physics accuracy in electrical investigations dynamics experiments using light gates experiments hookes law and young modulus experiments with waves gas. Hooke s law question physics as cie a level physics questions topic materials young modulus young modulus multiple choice question please help young s modulus a level physics advanced higher physics project.

In physics teaching laboratories, we often use spring balances to measure force. Hookes law and youngs modulus a level physics teaching. This shows that force is proportional to extension. E the young modulus in pascals pa f force in newtons n l original length in metres m a area in square metres m 2 d l change in length in metres m measurement of the young modulus. If this page is correct, then the other one will need correcting. The international standard symbols for the moduli are derived from. Youngs modulus can be defined at any strain, but where hookes law is.

Students explore hooke s law while working in small groups at their lab benches. Within certain limits, the force required to stretch an elastic object such as a metal. The height of the water in the capillary above the level of the liquid in the surrounding. Such materials are called linear, and are said to obey hooke s law. E is a constant because l, a and k are all constant.

Hookes law alevel physics ocr, aqa, edexcel youtube. The height of the water in the capillary above the level of the liquid in the. Apr 11, 2012 a description of hooke s law, the concepts of stress and strain, young s modulus stress divided by strain and energy stored in a stretched material. Hooke s law is hugely relevant to all sorts of readers, but this article seems to be written for the benefit of graduate students in physics and mechanics. Dec 27, 2015 mini physics is a participant in the amazon services llc associates program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.

Under this circumstance, the ratio between stress and strain is constant. This means that the extension of the sample increases linearly with the amount of force applied. That is, the extension produced in a wire is directly proportional to the load attached to it. They come with information, facts, example questions, tests and mark schemes for most of the questions anyway. It can be shown that for isotropic materials the bulk modulus is. It will concentrate on how best to make the practical work produce accurate and reliable data, and the graphical work and calculations resulting. Recall hookes law first stated formally by robert hooke in the true theory of elasticity or. Youngs modulus is also termed the modulus of elasticity. Hooke s law of elasticity, and the value of young s modulus, are derived from molecular forces. This physics video tutorial provides a basic introduction into elasticity and hookes law. This can be easily shown by substituting for k fx into the equation for e. In this region between the origin and point 2, the ratio of stress to strain young s modulus is constant, meaning that the material is obeying hooke s law, which states that a material is elastic it will return to its original shape if force is directly proportional to extension of the material hooke s law. Examples of linear materials include steel, carbon fiber, and glass. Hookes law states that, for certain elastic materials, force is proportional to extension, when a sample is stretched.

Our present interest is in whether or not the data will fit on a linear trend line. Hooke s law in the diagram below is shown a block attached to a spring. For many materials, young s modulus is a constant over a range of strains. A force must be applied to compress or extend a spring. This physics factsheet looks at some of the experimental work linked to the topic. As well as the qualitative descriptive work, there is quantitative work including hookes law, force constant, breaking stress and the determination of young modulus for a material. The basic idea behind hooke s law is that the change in length of a stretching. It is a mechanical property of linear elastic solid materials, and will be more or less dependent on temperature, depending on the material being considered. Youngs modulus, hookes law and material properties. Youngs modulus is a numerical constant, named after the 18thcentury english physician and physicist thomas young. A description of hookes law, the concepts of stress and strain, youngs modulus stress divided by strain and energy stored in a stretched.

Experiments hookes law and youngs modulus curriculum press. Pdf graphical representation of the generalized hookes law. The software is user friendly, intuitive and it looks good on the screen, with graphics that resemble real laboratory equipment. Hookes law and youngs modulus a level physics youtube. The cohesive energy of materials is an important topic in solid state physics. In mechanics physics, hookes law is an approximation of the response of elastic i.

For a given material, young s modulus e is the ratio of stress to strain, provided the limit of. If youre behind a web filter, please make sure that the domains. They collect displacement data for springs with unknown spring constants, k, by adding various masses of known weight. This stretching behavior is summarized in a stressstrain graph. Jun 11, 2012 a description of hooke s law, the concepts of stress and strain, young s modulus stress divided by strain and energy stored in a stretched material. The symbol for youngs modulus is usually e from the french word elasticite. The young modulus for a wire can be measured using this equipment. Stress, strain, youngs modulus problems and solutions. Rubber and soil except at very low strains are nonlinear materials. A description of hooke s law, the concepts of stress and strain, young s modulus stress divided by strain and energy stored in a stretched material.

The article should be made interesting to people who have only a high school math education. Investigating the extension of a spring while changing the load force. This physics video tutorial provides a basic introduction into elasticity and hooke s law. Hookes law in the diagram below is shown a block attached to a spring.