Core Practical 4: Investigating Viscosity of a Liquid Aim of the Experiment By allowing small spherical objects of known weight to fall through a fluid until they reach terminal velocity, the visco...
Stoke's Law Viscous Drag Viscous drag is defined as the frictional force between an object and a fluid which opposes the the motion between the object and the fluid Viscous drag is calculated using...
Upthrust Archimedes' Principle Archimedes’ principle states: An object submerged in a fluid at rest has an upward buoyancy force (upthrust) equal to the weight of the fluid displaced by the object ...
Density Density is the mass per unit volume of an object Objects made from low-density materials typically have a lower mass For example, a balloon is less dense than a small bar of lead des...
Modelling the Variation of Resistance with Illumination Light can cause a change in conductivity of some semi-conductors When light is absorbed by the material it causes more electrons to be availa...
Modelling the Variation of Resistance with Temperature All materials have some resistance to the flow of charge As free electrons move through a metal wire, they collide with ions which get in thei...
Core Practical 3: Investigating E.M.F. & Internal Resistance Aims of the Experiment The overall aim of the experiment is to investigate the relationship between e.m.f. and internal resistance b...
E.M.F. vs. Terminal Potential Difference Terminal Potential Difference The terminal potential difference (p.d.) is the potential difference across the terminals of a cell If there was no internal r...
Internal Resistance All power supplies have some resistance between their terminals This is called internal resistance (r) Internal resistance causes some electrical energy to be transformed...
