Share P4 Heat and Light Revision
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Light allows us to see an object when the object ___________ light into our eyes.
Light allows us to see an object when the object reflects light into our eyes.
Give two examples of sources of light.
The Sun OR Stars OR Fire OR Torches OR Lamps
Describe how shadow is formed.
A shadow is formed when light is partially or completely blocked by an object.
How to make the size of a shadow bigger?
Move the light source closer to the object. OR Move the screen further away from the object.
How to make the size of a shadow smaller?
Move the light source further away from the object. OR Move the screen closer to the object.
What is temperature?
Temperature is a measure of how hot something is.
Give an example of a source of heat.
The Sun OR burning wood OR Electrical appliances
How does heat travels?
Heat always travel from a hotter place to a colder place until both places reach the same temperature.
When an object is heated by a heat source, it will _____ heat from the heat source and _____.
When an object is heated by a heat source, it will gain heat from the heat source and expand.
When a heated object is left to cool, it will ______ heat to the surroundings and ______.
When a heated object is left to cool, it will lose heat to the surroundings and contract.
Temperature is measured in _______________ using a ___________.
Temperature is measured in degree Celsius (°C) using a thermometer.
What are the good conductors of heat?
Good conductors of heat allow heat to flow through faster. [rate] Good conductors of heat allow more heat to flow through. [quantity]
What are the poor conductors of heat?
Poor conductors of heat allow heat to flow through slower. [rate] Poor conductors of heat allow less heat to flow through. [quantity]
Give an example of a material that is a good conductor of heat.
metal
Give an example of a material that is a poor conductor of heat.
plastics OR wood OR rubber
