Heat Transfer
How many types of heat transfers are there? List all three.
Three ; Conduction, Convection, Radiation
What is conduction?
A heat transfer that is caused from direct contact.
Does thermal energy transfer from hot to cold or cold to hot?
Hot to cold.
Do solids, gases or liquids have the most kinetic energy?
Gases have the most kinetic energy.
What is radiation?
The transfer of heat through electromagnetic waves
A man is holding an ice cube in his hand. How will thermal energy flow?
A) Up; From the hand to the ice cube
B) Down; From the ice cube to the hand
C) Back and forth; from the ice cube down to the hand a d the hand back to the ice cube
D) There is no energy flow
A) Up; From the hand to the ice cube
Hot to cold.
What is convection?
The transfer of heat through the movement of liquids or gases through currents.
Two part question.
1. Does a substance with higher temperature have more or less kinetic energy?
2. A man is holding an ice cube in his hand. How will thermal energy flow?
1. More kinetic energy
2. Up; Hot to cold
If there is oil cooking in a pan, thermal energy is being transferred from the pan to the oil. What type of heat transfer is taking place?
A) Convection
B) Conduction
C) Conservation
D) Radiation
B) Conduction
What is the relationship between kinetic energy and temperature?
A) There is no relationship between kinetic energy and temperature
B) The higher the temperature, the more kinetic energy it has
C) The lower the temperature, the more kinetic energy it has
D) The relationship depends on the state of matter of the substance.
B) The higher the temperature, the more kinetic energy it has
A cup shows the transfer of thermal energy. If the cup has arrows going back and forth facing one another, what type of thermal energy transfer is being illustrated?
A) All three types of thermal transfers are being illustrated.
B) Electromagnetic waves of radiation.
C) Direct transfer of thermal energy by conduction.
D) Heat rising, cooling, and sinking by convection.
D) Heat rising, cooling, and sinking by convection.
What is an example of thermal energy transfer by radiation?
A) Water boiling from a stove top.
B) A heat lamp warming up a snail on a desk.
C) A person running on sand on a beach.
D) A balloon releasing air and being blown back up.
B) A heat lamp warming up a snail on a desk.
On a trip to the woods, Sally picked up a pan by its handle and burned herself. The pan is over a hot fire sitting over the flames.
Which explanation correctly explains why the handle of the pan is so hot?
A) The contents of the pan transfer thermal energy to the handle by convection.
B) Flames warm the bottom of the pan by conduction and radiation, and thermal energy transfers through the pan to the handle by conduction.
C) Because the handle of pan is close enough to the flames to be affected by radiation, it warms.
D) The pan is sitting in sunlight and the handle warms by radiation.
D)
B) Flames warm the bottom of the pan through conduction and radiation, and thermal energy transfers through the pan by conduction.
There's an ice cube that sits on a table. It begins to melt. Which direction does the thermal energy move between the table and the ice cube as it melts?
A) The thermal energy from the ice cube goes down towards the table.
B) The thermal energy from the ice cube goes to the side angle away from the table.
C) The thermal energy from the ice cube goes back and forth - to the table and away from the table.
D) The thermal energy from the table goes up towards the ice cube.
D) The thermal energy from the table goes up towards the ice cube.
Hot to cold.
A graph shows the timeline of the temperature change in ice cream placed out of a freezer (2 degrees C) melting to form a liquid until the liquid reaches room temperature (25 degrees C).
Which statement correctly describes thermal energy movement?
A) Thermal energy moves back and forth between the ice cream and the room.
B) The ice cream gives thermal energy to the room.
C) The ice cream absorbs thermal energy from the room.
D) Thermal energy in the room absorbs the cold from the ice cream.
C) The ice cream absorbs thermal energy from the room.