Difference between revisions of "Plane Figures: Horizontal line - curved or straight?"
From wikisori
(New page: === Age === <br> === Materials === <br> === Preparation === <br> === Presentation === <br> === Control Of Error === <br> === Points Of Interest === <br> === Purpose...) |
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Line 1: | Line 1: | ||
=== Age === | === Age === | ||
− | <br> | + | 6-9.<br> |
=== Materials === | === Materials === | ||
− | <br> | + | *A globe |
+ | *Frame of smallest circle inset | ||
+ | *Knitting needle<br> | ||
=== Preparation === | === Preparation === | ||
− | <br> | + | <br> |
=== Presentation === | === Presentation === | ||
− | <br> | + | #Invite the child to identify their hometown on the globe. |
+ | #Place the inset frame on the globe so that the town coincides with the center of the circle. | ||
+ | #This curve (the rim of the frame) represents the horizon for everyone living here in and around the town. | ||
+ | #Because we are standing outside the earth we see the entire horizon as a circle, instead of as an arc-part of the circumference. | ||
+ | #With the chalk mark a point on the floor. | ||
+ | #Draw a circle around this center point. | ||
+ | #Invite the child to stand at the center. | ||
+ | #What do you see? Without turning the child can only see an arc, a part of the circumference. | ||
+ | #Reinforce the facts that in these demonstrations the child is much bigger than the circle on the globe or on the floor, when in reality it is the reverse. | ||
+ | #The child is a tiny, tiny point in relation to the earth which is huge. | ||
+ | #The curvature of that arc would be so slight that you would only be able to see a straight line. | ||
+ | #With the knitting needle, hold it so that it forms an arc on a horizontal plane. | ||
+ | #Invite the child to identify what he sees as he lowers his body..... a curved line.... a curved line... a straight line. | ||
+ | #At eye level this curved line looks like a straight line.<br> | ||
=== Control Of Error === | === Control Of Error === | ||
− | <br> | + | <br> |
=== Points Of Interest === | === Points Of Interest === | ||
− | <br> | + | <br> |
=== Purpose === | === Purpose === | ||
− | <br> | + | <br> |
=== Variation === | === Variation === | ||
− | <br> | + | <br> |
=== Links === | === Links === | ||
− | <br> | + | <br> |
=== Handouts/Attachments === | === Handouts/Attachments === | ||
− | <br> | + | <br> |
− | [[Category:Mathematics]] | + | [[Category:Mathematics]] [[Category:Mathematics_6-9]] |
Latest revision as of 04:54, 31 July 2009
Contents
Age
6-9.
Materials
- A globe
- Frame of smallest circle inset
- Knitting needle
Preparation
Presentation
- Invite the child to identify their hometown on the globe.
- Place the inset frame on the globe so that the town coincides with the center of the circle.
- This curve (the rim of the frame) represents the horizon for everyone living here in and around the town.
- Because we are standing outside the earth we see the entire horizon as a circle, instead of as an arc-part of the circumference.
- With the chalk mark a point on the floor.
- Draw a circle around this center point.
- Invite the child to stand at the center.
- What do you see? Without turning the child can only see an arc, a part of the circumference.
- Reinforce the facts that in these demonstrations the child is much bigger than the circle on the globe or on the floor, when in reality it is the reverse.
- The child is a tiny, tiny point in relation to the earth which is huge.
- The curvature of that arc would be so slight that you would only be able to see a straight line.
- With the knitting needle, hold it so that it forms an arc on a horizontal plane.
- Invite the child to identify what he sees as he lowers his body..... a curved line.... a curved line... a straight line.
- At eye level this curved line looks like a straight line.
Control Of Error
Points Of Interest
Purpose
Variation
Links
Handouts/Attachments