Difference between revisions of "Shadows"
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A '''shadow''' is a dark area caused by an object blocking the [[light]]. | A '''shadow''' is a dark area caused by an object blocking the [[light]]. | ||
===About Shadows=== | ===About Shadows=== | ||
| − | : A shadow can be caused by an [[Opacity|opaque]] object blocking the light from any light source like | + | : A shadow can be caused by an [[Opacity|opaque]] object blocking the light from any light source like [[The Sun]], or a light bulb. |
{| class="wikitable" | {| class="wikitable" | ||
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|[[File:ShadowStick1.png|center|200px]] | |[[File:ShadowStick1.png|center|200px]] | ||
|[[File:ShadowStick2.png|center|200px]] | |[[File:ShadowStick2.png|center|200px]] | ||
| − | |[[File:ShadowStick3.png|center| | + | |[[File:ShadowStick3.png|center|250px]] |
|- | |- | ||
| style="height:20px; width:200px; text-align:center;" |When the light source is overhead the '''shadow''' is underneath the object. | | style="height:20px; width:200px; text-align:center;" |When the light source is overhead the '''shadow''' is underneath the object. | ||
| style="height:20px; width:200px; text-align:center;" |When the light source gets lower the '''shadow''' gets longer. | | style="height:20px; width:200px; text-align:center;" |When the light source gets lower the '''shadow''' gets longer. | ||
| − | | style="height:20px; width: | + | | style="height:20px; width:250px; text-align:center;" |The lower the light source, the longer the '''shadow'''. |
|} | |} | ||
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|+ The size and shape of a '''shadow''' depends on the position of the light source and object. | |+ The size and shape of a '''shadow''' depends on the position of the light source and object. | ||
|- | |- | ||
| − | |[[File:ShadowCylinder1.png|center| | + | |[[File:ShadowCylinder1.png|center|300px]] |
| − | |[[File:ShadowCylinder3.png|center| | + | |[[File:ShadowCylinder3.png|center|300px]] |
| − | |[[File:ShadowCylinder2.png|center| | + | |[[File:ShadowCylinder2.png|center|300px]] |
|- | |- | ||
| style="height:20px; width:200px; text-align:center;" |When the light source is far away the '''shadow''' is smaller. | | style="height:20px; width:200px; text-align:center;" |When the light source is far away the '''shadow''' is smaller. | ||
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| style="height:20px; width:200px; text-align:center;" |If you move the object around you can get a different shaped '''shadow'''. | | style="height:20px; width:200px; text-align:center;" |If you move the object around you can get a different shaped '''shadow'''. | ||
|} | |} | ||
| + | |||
===Note for Teachers=== | ===Note for Teachers=== | ||
In year 7 students frequently answer the following question incorrectly: | In year 7 students frequently answer the following question incorrectly: | ||
| − | Only | + | Only [[The Sun]] can cause shadows: True or False? It is unclear where this misconception comes form but teachers should take special care to ensure students consider this question thoughtfully. |
Latest revision as of 11:00, 2 November 2018
Key Stage 2
Meaning
A shadow is a dark area caused by an object blocking the light.
About Shadows
- A shadow can be caused by an opaque object blocking the light from any light source like The Sun, or a light bulb.
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| When the light source is overhead the shadow is underneath the object. | When the light source gets lower the shadow gets longer. | The lower the light source, the longer the shadow. |
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| When the light source is far away the shadow is smaller. | When the light source is closer to the object the shadow is bigger. | If you move the object around you can get a different shaped shadow. |
Note for Teachers
In year 7 students frequently answer the following question incorrectly: Only The Sun can cause shadows: True or False? It is unclear where this misconception comes form but teachers should take special care to ensure students consider this question thoughtfully.