FIELDS REVISION by Lizelle Swanepoel https://padlet.com/lizellexs/n3g6kajhay6m764 en-us 2020-07-16 07:09:01 UTC 2025-10-09 21:15:39 UTC hello@padlet.com https://padlet.net/icons/png/1f30d.png INTRODUCTION lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655826300 GRAVITATIONAL FIELDS]]> 2020-07-16 07:16:29 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655826300 UNIVERSAL GRAVITATION EXPLAINED lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655826416 Watch the video below.]]> 2020-07-16 07:16:46 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655826416 THE STORY OF GRAVITY STARTS WITH THESE SCIENTIFIC GIANTS lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655826515 Copernicus, Galileo, Kepler, Newton, Einstein.]]> 2020-07-16 07:16:58 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655826515 Galileo’s experiment on the moon in 1971 - feather hammer drop lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655826631 2020-07-16 07:17:09 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655826631 The Law of Universal Gravitation lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655826752 In a nutshell ]]> 2020-07-16 07:17:24 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655826752 Newton's Law of Universal Gravitation states: lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655826817 Every particle with mass in the universe attracts every other particle with a
force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres.]]> 2020-07-16 07:17:32 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655826817 Universal Gravitation formula lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655826893 WHERE:
F = force
m = mass
r = distance two objects are apart (distance between their centers)
G = Universal gravitational constant (Newton's constant) = 6.673×10-11 N m2 kg-2

]]> 2020-07-16 07:17:43 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655826893 GRAPHS lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655826953 2020-07-16 07:17:53 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655826953 EFFECT OF CHANGING DISTANCE lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655827010 2020-07-16 07:18:00 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655827010 CAVENDISH EXPERIMENT TO MEASURE "G" lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655827071 Performed in 1797–98 by British scientist Henry Cavendish]]> 2020-07-16 07:18:09 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655827071 lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655827165 2020-07-16 07:18:23 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655827165 SUPERMAN, KRYPTON AND GRAVITY lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655827244 Superman's strength must be partly attributed to the gravitational field of his home planet, Krypton. 

  • The people of Krypton evolved to stand, walk, and lift ordinary objects in Krypton's strong gravitational field. 
  • When Superman came to Earth, he found that his Kryptonian physique was sort of over-designed. 
  • He could "leap over tall buildings in a single bound", for example. Let's see Superman in action:
]]> 2020-07-16 07:18:32 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655827244 SIMPLE PROBLEM SOLVING ON UNIVERSAL GRAVITATION lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655827406 2020-07-16 07:18:50 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655827406 FURTHER PROBLEMS AND WORKED SOLUTIONS lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655827479 2020-07-16 07:18:57 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655827479 PROPORTIONALITY IN THE UNIVERSAL GRAVITATION EQUATION lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655827553 2020-07-16 07:19:05 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655827553 GRAVITATIONAL FIELD STRENGTH lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655827723 2020-07-16 07:19:29 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655827723 CALCULATING "g" of any planet lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655827803 2020-07-16 07:19:39 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655827803 lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655827912 2020-07-16 07:19:53 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655827912 lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655828023 2020-07-16 07:20:05 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655828023 lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655828077 2020-07-16 07:20:12 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655828077 GALILEO VS. NEWTON VS. EINSTEIN lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655828152 Famous Ball-and-Feather Experiment]]> 2020-07-16 07:20:19 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655828152 WATCH THIS: lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655828223 2020-07-16 07:20:27 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655828223 lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655828335 2020-07-16 07:20:40 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655828335 FIELDS QUESTION lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655828467 2020-07-16 07:20:57 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655828467 FIELDS MEMO lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655828553 2020-07-16 07:21:05 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655828553 ELECTROSTATICS lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655828818 2020-07-16 07:21:37 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655828818 lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655828886 2020-07-16 07:21:45 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655828886 ELECTRIC CHARGE lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655828986 2020-07-16 07:21:57 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655828986 CHARGE lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655829080 2020-07-16 07:22:09 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655829080 TRIBOELECTRIC SERIES lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655829178 2020-07-16 07:22:16 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655829178 DEVICES USED TO STUDY CHARGE lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655829313 2020-07-16 07:22:30 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655829313 Van de Graaff generator lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655829384 2020-07-16 07:22:38 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655829384 ROBERT VAN DE GRAAFF (1901 – 1967) lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655829516 He was a Dutch-American physicist, noted for his design and construction of high-voltage Van de Graaff generators.]]> 2020-07-16 07:22:53 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655829516 Wimshurst machine lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655829604 2020-07-16 07:23:02 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655829604 lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655829682 2020-07-16 07:23:10 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655829682 PRINCIPLE OF CONSERVATION OF CHARGE lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655829779 The principle of conservation of charge states:
The net charge of an isolated system remains constant during any physical process (e.g. two charged objects making contact and separating).]]> 2020-07-16 07:23:21 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655829779 CHARGE ON INSULATORS VS CONDUCTORS lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655829985
  • Metals are good conductors, so charge is free to move around in and on it. 
  • Insulators (e.g. plastic and rubber) don't allow electric charges to move through them.
    • ]]>     2020-07-16 07:23:41 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655829985     lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655830107 2020-07-16 07:23:54 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655830107 THE CHARGE ON AN ELECTRON lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655830200 The elementary charge, usually denoted by e or sometimes qe, is the electric charge carried by a single electron.]]> 2020-07-16 07:24:03 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655830200 QUANTISATION OF CHARGE lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655830320 2020-07-16 07:24:13 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655830320 SHARING OF CHARGE lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655830465 2020-07-16 07:24:30 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655830465 lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655830575 2020-07-16 07:24:37 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655830575 PROBLEM: CHARGE ON CONDUCTING SPHERES AFTER TOUCHING AND SEPARATION lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655830646 2020-07-16 07:24:45 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655830646 POLARIZED WATER STREAM INTERACTS WITH CHARGED OBJECTS lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655830755 2020-07-16 07:24:57 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655830755 ELECTROSTATIC FORCE FALLS OFF WITH DISTANCE lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655830829 2020-07-16 07:25:05 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655830829 COULOMB'S LAW lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655830931 2020-07-16 07:25:16 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655830931 COULOMB'S EXPERIMENT lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655831009 2020-07-16 07:25:25 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655831009 NET FORCE BETWEEN THREE POINT CHARGES lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655831108
    The following three charges with distances apart are given:

    ]]>     2020-07-16 07:25:37 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655831108     Calculate the net force on q1 lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655831257


    Solution:]]>     2020-07-16 07:25:53 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655831257     lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655831327 2020-07-16 07:26:00 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655831327 EXAMPLE 2 lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655831423 Calculate the net force on the red charge.]]> 2020-07-16 07:26:11 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655831423 lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655838307 ELECTROSTATIC FIELDS]]> 2020-07-16 07:38:07 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655838307 Coulomb's law states: lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655840219 Two point charges in free space or air exert forces on each other. The force is directly proportional to the product of the charges and inversely proportional to the square of the distance between the charges.]]> 2020-07-16 07:41:43 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/655840219 INTRODUCTION VIDEO lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/662316132 Watch this:]]> 2020-07-25 10:18:58 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/662316132 ELECTROSTATIC VS GRAVITATIONAL FIELDS IN ACTION - BUILD YOUR OWN PARTICLE ACCELERATOR! lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/662317439 2020-07-25 10:26:58 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/662317439 HOW TO USE THIS PADLET lizellexs https://padlet.com/lizellexs/n3g6kajhay6m764/wish/724805000
  • Magnify posts by clicking ctrl+ on your computer
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  • Watch all posted videos in the Padlet to assist learning this section
  • Watch all my posted teaching videos on Classroom as overview of each topic
    • ]]>     2020-09-07 13:04:24 UTC https://padlet.com/lizellexs/n3g6kajhay6m764/wish/724805000