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This publication is stuffed with transparent notes and exam-style perform questions protecting each AS Physics subject for the Edexcel tests. the complete thing’s designed to make revision undemanding - every little thing you must understand is defined easily and carefully, helped by way of full-colour diagrams. It features a part on How technology Works and lots of examination assistance. There’s additionally a sprinkling of jokes to lighten the temper. It’s precisely what you must arrange on your assessments!
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Extra resources for AS-Level Physics Edexcel Complete Revision & Practice
They don’t go anywhere... um... You get Standing Waves When a Progressive Wave is Reflected at a Boundary A standing wave is the superposition of two progressive waves with the same wavelength, moving in opposite directions. 1) Unlike progressive waves, no energy is transmitted by a standing wave. 2) You can demonstrate standing waves by setting up a driving oscillator at one end of a stretched string with the other end fixed. The wave generated by the oscillator is reflected back and forth. 3) For most frequencies the resultant pattern is a jumble.
Area under graph = Strain energy per unit volume Nm–2 E= 1) 2) 3) stress strain = gradient The gradient of the graph gives the Young modulus, E. e. the energy stored per 1 m3 of wire. The stress-strain graph is a straight line provided that Hooke’s law is obeyed, so you can also calculate the energy per unit volume as: energy = ½ × stress × strain Practice Questions Q1 Define the Young modulus for a material. Q2 What are the units for the Young modulus? Q3 Explain why a thin test wire is used to find the Young modulus.
If the forces stretch the material, they’re tensile. If the forces squash the material, they’re compressive. e. the extension, divided by the original length of the material: strain = original length l e l extension e Strain has no units — it’s just a number. 3) cross-sectional area A F A The units of stress are Nm–2 or pascals, Pa. 2) F It doesn’t matter whether the forces producing the stress and F strain are tensile or compressive — the same equations apply. The only difference is that you tend to think of tensile forces as positive, and compressive forces as negative.