Hooke law and young modulus a-level physics pdf

The height of the water in the capillary above the level of the liquid in the. If one end of the spring is fixed, this force will act over a certain distance and so will perform work. Unlock the full alevel physics course at created by elisavet, physics expert at snaprevise. It will concentrate on how best to make the practical work produce accurate and reliable data, and the graphical work and calculations resulting. In position b a force f is used to compress the spring by a length equal to. Physclips provides multimedia education in introductory physics mechanics at different levels. Hookes law alevel physics ocr, aqa, edexcel youtube. 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. Youngs modulus, hookes law and material properties. Youngs modulus measures the resistance of a material to elastic deformation. They come with information, facts, example questions, tests and mark schemes for most of the questions anyway. 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. In mechanics physics, hookes law is an approximation of the response of elastic i.

Hooke s law states that the extensionx of a spiral spring. Nov 04, 2011 powerpoint and worksheet on hookes law that i use for as ocr physics. Youngs modulus for zero strain, and therefore an absolute constant. Students explore hooke s law while working in small groups at their lab benches. This physics video tutorial provides a basic introduction into elasticity and hookes law. Pearson edexcel centre number candidate number level 3 gce. Pdf graphical representation of the generalized hookes law. Recall hookes law first stated formally by robert hooke in the true theory of elasticity or. It can be shown that for isotropic materials the bulk modulus is. 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. Finally we will cover a young s modulus 2 shear modulus 3 bulk modulus. Our present interest is in whether or not the data will fit on a linear trend line.

Hookes law forces and elasticity aqa gcse combined. National 5 assignment nat hookes law a mrs physics. The reference wire and test wire are hung from the ceiling. Hookes law in terms of a loaddisplacement and b stressstrain. A string has a diameter of 1 cm and the original length of 2 m. Hookes law states that for a material within its elastic limit, the force. The software is user friendly, intuitive and it looks good on the screen, with graphics that resemble real laboratory equipment. The basic idea behind hooke s law is that the change in length of a stretching. The oscillations of a cantilever are determined by its youngs modulus. That is, the extension produced in a wire is directly proportional to the load attached to it. 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. Youngs modulus is also termed the modulus of elasticity. A description of hookes law, the concepts of stress and strain, youngs modulus stress divided by strain and energy stored in a stretched. This physics factsheet looks at some of the experimental work linked to the topic.

Modules may be used by teachers, while students may use the whole package for self instruction or for reference. Hookes law in my opinion rests entirely upon experiment, nor does it seem to me. Youngs modulus is a measure of the ability of a material to withstand changes in length under lengthwise tension or compression. Under this circumstance, the ratio between stress and strain is constant. The elastic limit of a material is the furthest point it can be stretched or deformed while being able to.

The height of the water in the capillary above the level of the liquid in the surrounding. The basic idea behind hookes law is that the change in. Young s modulus, also known as the elastic modulus, is a measure of the stiffness of a solid material. If youre behind a web filter, please make sure that the domains. Hooke s law of elasticity, and the value of young s modulus, are derived from molecular forces. If youre seeing this message, it means were having trouble loading external resources on our website. Experiments hookes law and youngs modulus curriculum press. Hookes law and youngs modulus a level physics youtube. E is a constant because l, a and k are all constant. 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. Such materials are called linear, and are said to obey hooke s law. Materials that obey hookes law are called hookean materials. Hookes law states that, for certain elastic materials, force is proportional to extension, when a sample is stretched. Rubber and soil except at very low strains are nonlinear materials.

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. Hookes law and youngs modulus a level physics teaching. The basic idea behind hookes 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. A force must be applied to compress or extend a spring. The physics is put into context by linking the properties of materials to their uses in engineering, construction, medical sciences and the manufacture of. They collect displacement data for springs with unknown spring constants, k, by adding various masses of known weight. The young modulus for a wire can be measured using this equipment.

This means that the extension of the sample increases linearly with the amount of force applied. This slideshow covers the following content of the 2015 edexcel a level physics course. Ocr as and a level physics a delivery guide understanding. A description of hookes law, the concepts of stress and strain, youngs modulus stress divided by strain and energy stored in a stretched material. If this page is correct, then the other one will need correcting. On a stressstrain graph the young s modulus is constant for the portion of the graph where hooke s law applies. For a given material, young s modulus e is the ratio of stress to strain, provided the limit of. This stretching behavior is summarized in a stressstrain graph. 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. For many materials, young s modulus is a constant over a range of strains. 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. The symbol for youngs modulus is usually e from the french word elasticite.

In physics teaching laboratories, we often use spring balances to measure force. I put it in the article so that people would be aware that there is an inconsistency if requiring the information. In position a the spring is at rest and no external force acts on the block. For instance, the spring is pulled downwards with either no load, f p, or twice f p. Youngs modulus is a numerical constant, named after the 18thcentury english physician and physicist thomas young.

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. The international standard symbols for the moduli are derived from. 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. 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 cohesive energy of materials is an important topic in solid state physics. Young modulus data table, inconsistency i have added alternative e for polyethylene terephthalate from its wiki page.

Youngs modulus physics revision gcse and a level physics. This shows that force is proportional to extension. To determine the spring constant, oliver, a year 12 pupil, measured the distance that one side of the rubber extended, when various. Stress, strain, youngs modulus problems and solutions.

This can be easily shown by substituting for k fx into the equation for e. Hookes law states that within the limit of elasticity, stress applied is directly proportional to strain produced. The young modulus of a material is defined as the ratio of stress to strain. Investigating the extension of a spring while changing the load force. 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. 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. Examples of linear materials include steel, carbon fiber, and glass. Hooke s law in the diagram below is shown a block attached to a spring. This physics video tutorial provides a basic introduction into elasticity and hooke s law.