Heat
3 examples of heat.
Sun, burning wood, toaster, rice cooker, iron, hair dryer.
When an object gains heat, does the temperature increase or decrease?
Increase.
What is light?
Light is a form of energy that helps us see things.
What kind of materials let light pass through?
Transparent and translucent (slightly) materials.
What is heat?
Heat is a form of energy. It cannot be seen but can be felt. It makes things warm or hot.
Example of good and bad conductor of heat.
Good: Metal
Bad: Plastic, wood, air.
3 examples of sources of light.
Sun, fire, stars, torches, light bulbs.
Where do shadows form?
On the opposite side of an object.
What is temperature?
Temperature is a measure of how hot or cold an object is.
What rate does heat flow through good conductors of heat?
Heat flows through good conductors of heat quickly.
How does light help us see things?
Light bounces off an object and reflects into our eyes.
What is a shadow?
A dark area that forms when an object blocks light from reaching a surface.
How does heat flow?
From a hotter to colder region until both reach the same temperature.
How does heat gain change solid?
Heat gain changes solid to liquid.
What are mirrors used for?
Mirrors can be used to help us see things that are not in front of our eyes.
What happens to the size of the shadow when the light source moves closer to the object?
It becomes bigger.
Which has a larger amount of heat? 100ml of water at 20ºC or 50ml of water at 100ºC
50ml of water at 100ºC
What is the effect of heat gain and loss to objects?
Heat gain causes expansion, heat loss causes contraction.
Why does a shadow form?
Light travels in a straight line and cannot pass through the object.
What happens when the object moves closer to the screen?
The shadow becomes smaller.