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Science L6 Term 4 Review 2022
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What 2 forces hold a space station in place?
Gravity and inertia
Conduction is the transfer of heat between 2 objects that are touching
True
What is convection ?
Transfer of heat by movement of water or a gas
What makes a microwave work? Vibrating of water molecules or vibration of the radiation waves
Vibration of water molecules
Explain gravity
Force from the center of earth that keeps us planted on solid ground
Does a microwave use less or more electricity?
Less as faster cooking time
How does a conventional oven cook food? By heat or by causing the molecules to be active?
Heat
What is conduction? Moving of heat from one place to another?
True
Why would a microwave be more beneficial to cook your food?
Faster and time saving and electricity saving
Which containers SHOULD you use when heating or cooking food in a microwave?
Plastic ...glass...paper...ceramics
What happens if you use metal in a microwave?
Sparks
Metal is a good material to use when heating food or cooking food in a microwave?
No.
What energy does a microwave convert to? electrical or thermal energy?
Thermal
How do microwaves cook food? Heating water molecules or heating the bowl?
Heating water molecules
Microwaves to cook food are 12 cm or 20cm in length?
12 cm
Waves with longer wavelengths have more or less energy?
Less
Waves with shorter wavelengths have more or less energy?
More
What is energy from the sun called ?
Solar energy or radiation
Can radiation move through space and matter?
Yes
What is radiation? Transfer of energy by waves or by sound?
By waves
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