Difference between revisions of "3-ELE-08"
(→Starter) |
(→Main Body of Lesson) |
||
| Line 30: | Line 30: | ||
==Main Body of Lesson== | ==Main Body of Lesson== | ||
| + | |||
| + | How do we plot this force field when we cannot see it? | ||
| + | Introduce idea that forces have direction and we plot force fields by placing a small north pole in the magnetic field of the bar magnet. We draw an arrow to show the direction of the force: Arrow shos direction of force on a tiny north pole placed at that point. | ||
| + | |||
| + | Prediction: Students to draw a bar magnet and, suing the above principle, predict the shape of the field around a bar magnet. You will need to do a field line for them to start them off. | ||
| + | |||
| + | Practical: | ||
| + | Using plotting compasses to plot magnetic force field around: | ||
| + | *a single bar magnet | ||
| + | *two bar magnets repelling | ||
| + | *two bar magnets attracting | ||
| + | |||
| + | Check whether the prediction was correct. | ||
| + | |||
==Plenary== | ==Plenary== | ||
==Homework== | ==Homework== | ||
Revision as of 04:35, 13 April 2008
Contents
Outcomes
- Pupils understand that magnets exert forces on each other and other magentic materials. These forces can be attraction or repulsion.
- Pupils can understand how to plot a magnetic field around:
- one bar magnet
- two bar magnets, attracting and repelling.
- Pupils understand that the direction of a magnetic field line indicates the direction of the force on a tiny north pole magnet placed in the filed at that point.
- Pupils can see that a uniform field can be created between to attracting bar magnets.
Specification References
6.2 recall that magnets repel and atract other magnets, and attract magnetic substances.
6.3 recall the properties of magnetically hard and soft materials
6.4 understand the term 'magnetic field line'
6.5 understand that magnetism is induced in some materials when they are placed in a magnetic field.
6.6 sketch and recognise the magnetic field pattern for a permanent bar magnet and that between two bar magnets
6.7 know how to use two permanent magents to produce a unifrom magnetic field.
Starter
Recall from lower school work that magnets have both north and south poles. Talk about idea of a 'magnetic force field'. Forces 'push' or 'pull' : 'attract' or repel'.
Starter practical: Use mini turntables or upturned watchglasses to show that N and N repel, S and S repel but N and S attract.
Main Body of Lesson
How do we plot this force field when we cannot see it? Introduce idea that forces have direction and we plot force fields by placing a small north pole in the magnetic field of the bar magnet. We draw an arrow to show the direction of the force: Arrow shos direction of force on a tiny north pole placed at that point.
Prediction: Students to draw a bar magnet and, suing the above principle, predict the shape of the field around a bar magnet. You will need to do a field line for them to start them off.
Practical: Using plotting compasses to plot magnetic force field around:
- a single bar magnet
- two bar magnets repelling
- two bar magnets attracting
Check whether the prediction was correct.
