If materials are pulled, then they stretch. Click again on the spring to return to main screen. technetium-99, thallium-201, iodine-131 and sodium-24). A coil of wire, screw gauge, a metre scale, battery, key, ammeter, voltmeter, rheostat and connecting Wires. This also describes ways of determining and combining uncertainties in experimental measurements . Use the Vernier scale to measure the sample width. Or follow the brief instructions here: Click on the link to download a pdf of the Instructions for operating the Resistivity experiment. You may wonder why we study springs and why questions about stretching springs appear on exams. 2. Open the calliper jaws, drag a sample of choice between the jaw and fully close the jaws around it. Click on the link below to download a pdf of example questions for the Resistivity experiment. Understanding how these materials respond to the applied loads is vital for informed materials selection. Gravity is responsible for stars forming in the first place, keeping the Sun from exploding from the heat it generates, and for the structure of galaxies. We use materials with low electrical resistivity to transmit electrical power from generators, across grid distribution networks, and to homes and workplaces for use. Download the full Instructions for the Hooke's Law experiment from the link (requires log in), There are lots of activities to do with the Hooke's Law experiment. Read the needle position on the dial to measure level of radiation. You can choose between two ways of timing the free fall, and you can even travel through space to measure the strength of gravity on different objects of the Solar system! This property is key to allowing us to understand how components will perform in thermal applications and help us to choose the most appropriate material. Medical imaging can use radioactive elements that naturally collect in particular parts of the body and image the radioactive emission. Close the micrometer and measure the wire's width. This experiment lets you practise selecting the appropriate colour bands on a resistor to achieve a certain resistance value. In this experiment you’ll learn how to use a DMM to measure voltage, current and resistance. Click the up arrow to increase the applied strain by the Step increment value. When made from elastic materials, such as most metals, springs stretch when pulled and return to their original size when released. Or see if you can do some of the following: Download the file below to see the scientific background of radioactive decay (requires log in). cobalt-60) are used to create a targeted radiotherapy treatment of cancer in these organs. Strong and stiff structures are used in vehicles (cycles, cars, trains, aeroplanes, spacecraft), bridges and buildings, sports equipment and bio-implants (e.g. This experiment will allow you to explore Ohm’s law by making measurements of voltage, current and resistance. Well, first, springs are incredibly useful. The simplest resistors are made of a thin film or wound wire of carbon or metal. Measuring electrical resistivity helps us to understand the properties of materials, to monitor manufacturing processes, and to select the best material for an application. Materials behave this way in any application where they have force applied to them, e.g. Thin but robust materials are used in touchscreens. Different materials, however, will have a different change in heat energy for a given change in temperature. These are: Exp 1. Download the attached file to see the scientific background to this experiment (requires login), The virtual experiment is fantastic. hip joint replacements). Open the micrometer by dragging the thumbwheel down.