4.2 Study Guide
What type of heat transfer happens when the sun is shining?
Radiation
How does a wood-fired pizza oven demonstrate all three type of heat transfer?
Radiation comes from the fire. Convection comes from the air going up and down as it warms and cools. Conduction comes from the energy in the pizza going into the floor of the oven below it.
how does thermal energy come into play when you heat up your dinner in the microwave?
Radiation is used to transfer the heat into the food.
What type of heat transfer occurs when you walk in the snow?
Conduction
What energy transformation occurs when you stir soup after heating it up?
Convection
What happens to energy when it moves?
It is always conserved within a system.
What is another way of saying energy transforms?
Energy can be changed completely from on form to another.
How is heat transferred?
Heat is transferred from warmer areas to cooler areas by conduction, convection, or radiation.
How is energy conserved during transformation?
It is never destroyed it just changes from one type of energy to another.
Is there a type of energy transformation in which the system destroys or creates energy?
No, the law of conservation of energy says that energy can't be created or destroyed.
What is convection?
The transfer of thermal energy by the movement of fluid.
What is a convection current?
The movement of a fluid, caused by differences in temperature, that transfers heat from one part of the fluid to another.
If an object completely changes in size, shape, color, or any other property what has happened to the object?
The object has transformed.
If you have two hot liquids of the same temperature, and you let one sit while you stir the other. Which one will cool down faster?
The one you stir will cool down faster.
Why would you rather have hot cocoa than lemonade on a cold day?
The thermal energy goes into your body and warms you up.
What is radiation?
The transfer of energy by electromagnetic waves.
What is conduction?
The transfer of energy from one particle of matter to another within an object or within two objects that are in direct contact.
Thermal energy can be transformed to do what?
Work.
Does the law of conservation of energy apply to everything?
Yes, even when energy transforms.
What are the three types of heat transfer?
conduction, convection, radiation
