Revision as of 05:07, 6 January 2010

Outcomes

Pupils understand that atoms have a neutral charge
Pupils understand that the movement of electrons (through friction) cause insulators to gain electrostatic charge
Pupils understand that materials can be made to have a temporary charge by induction
Pupils understand that electrostatic charges can apply forces on one another at a distance

2.20 identify common materials which are electrical conductors or insulators including metals and plastics
2.21 recall that insulating materials can be charged by friction
2.22 explain that positive and negative elecrostatic charges are produced on materials by the loss or gain of electrons
2.23 recall that there are forces of attraction between unlike charges and forces of repulsion between like charges
2.24 explain electrostatic phenomena in terms of the movement of electrons

Structure of an atom recap – get pupils to label each part of the atom (use the small white boards in each classroom)
Extend the pupils' knowledge of the atom by giving them the scale of the nucleus and atom (order of magnitude - mention Ångström)
Remind pupils about the idea of a 'balanced' atom (no charge), no. protons = no. electrons

Use this worksheet to investigating charging by friction. Pupils use a nanocoulombmeter to investigate charge. To extend this pupils can be asked how many electrons move from the duster to the rod or vice versa, given the charge of an electron.
Demo (this will be a class practical once we have the equipment) charging by induction - pupils use this worksheet to answer questions about induction.
The pupils should observe what happens when Rods with different and similar charges interact, this is best done using cradles to hang the rods so that they are free to spin.

Demo charging by friction and induction using rod rubbing: Water stream, bits of paper and Balloon rubbing - pupils use the minature white boards to draw a diagram of where the charges move to; they should be able explain what is happening to the charge.

In Complete Physics read pages 170-172 and answer questions 1-6 on page 171.
Identify as many objects at home that use the principle of static electricity to function.

Diagram of the atom
Rods (plastic and metal), cloths, paper bits, yokes hanging by a thread, baloons
Nananocolometeters

@@ Line 10: / Line 10: @@
 * 2.22 explain that positive and negative elecrostatic charges are produced on materials by the loss or gain of electrons
 * 2.23 recall that there are forces of attraction between unlike charges and forces of repulsion between like charges
+* 2.24 explain electrostatic phenomena in terms of the movement of electrons
 ==Starter==