Question

7th grade thermal energy review
multiple choice: which method of thermal energy transfer requires direct contact between particles?
a) conduction b) convection
c) radiation d) reflection

1. short answer: explain why a metal spoon gets hot when left in a pot of boiling soup.
2. multiple choice: which type of thermal transfer occurs when warm air rises and cool air sinks, creating a cycle?

a) conduction b) convection
c) radiation d) insulation

1. scenario: you are sitting by a campfire and feel warmth on your face even though you arent touching the fire. which method of heat transfer is happening?
2. multiple choice: which of the following is an example of radiation?

a) a pan heating on a stove burner b) the sun warming earth
c) hot chocolate warming a mug d) a heater warming the air

1. short answer: compare conduction and convection. how are they similar, and how are they different?
2. multiple choice: thermal energy always moves from:

a) cooler to warmer
b) warmer to cooler
c) high pressure to low pressure
d) none of the above

Explanation:

For question 1: Conduction is the transfer of thermal energy through direct contact between particles.
For question 3: Convection occurs when warm air (less dense) rises and cool air (more dense) sinks, creating a cycle.
For question 4: Radiation is the transfer of thermal energy in the form of electromagnetic waves. Sitting by a campfire and feeling warmth without direct contact is radiation.
For question 5: The Sun warming Earth is an example of radiation.
For question 7: Thermal energy always moves from warmer to cooler objects.

Answer:

1. A. Conduction
2. B. Convection
3. Radiation
4. B. The Sun warming Earth
5. B. Warmer to cooler