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...
Scholastic Art & Writing Awards?藝術(shù)與寫作獎(jiǎng)，是全美規(guī)模最大、歷史最悠久、聲譽(yù)最高的藝術(shù)和文學(xué)學(xué)術(shù)活動(dòng)，旨在尋找7-12年級(jí)學(xué)生的創(chuàng)意性作品。自1923年創(chuàng)辦以來(lái)，藝術(shù)與寫作獎(jiǎng)為青少年提供了展示創(chuàng)意和...
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...
Electromotive Force When charge passes through a power supply such as a battery, it?gains?electrical energy The?electromotive force (e.m.f.)?is defined as: The amount of chemical energy converted t...
距美本第一批（北卡教堂山等）EA截止 不足?20?天 距11.01大部分Top 100高校早申截止 不足?40?天 距11.15大部分Top 70文理校ED截止 不足?50?天 美國(guó)大學(xué)本科23fall早申請(qǐng)正在進(jìn)行中，部分學(xué)校將在10月截止申請(qǐng)！今...
Potential Dividers & Variable Resistance The Potentiometer A potentiometer is a single component which can act as a potential divider. It consists of a coil of wire with a sliding contact A var...
