The Whistle and the Funnel
You will need: A whistle, funnel, string.
Whirl this equipment in a
circle and the whistle will blow a note. The air which is forced through the
funnel into the whistle causes it to blow.
Now let a friend swing the
funnel horizontally while you stand to one side so that the whistle first
approaches and then retreats from you on its circular course.
position, the note from the whistle will seem to rise and falls like a siren.
(This is called 'Doppler's effect.')
Your friend, however, will hear only one tone.
Children learn best through doing
Before children can
understand a thing, they need experience: seeing, touching, hearing, tasting,
smelling; choosing, arranging, putting things together, taking things apart.
Experimenting with real things.
Old-time school teaching
used only words and the teachers thought children knew something if they could
repeat it. Now we know better. To reach practical understanding we do not need
to use many words with young children.
clever. They learn a lot, without being taught. The greatest skill - to be able
to talk, to communicate is learnt outside school. In the classroom it's the
children who need to talk the most. Unfortunately it is the teacher who does
most of the talking!