Energy Transfer Worksheet | PDF - Free Printable

Let's solve the Energy Transfer Worksheet step by step and explain each answer.

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Directions: Identify the following as conduction, convection, or radiation.

We need to recall the three methods of heat transfer:

- Conduction: Heat transfer through direct contact between materials (e.g., metal spoon in hot soup).
- Convection: Heat transfer through fluids (liquids or gases) via movement of heated particles (e.g., warm air rising).
- Radiation: Heat transfer through electromagnetic waves (e.g., sunlight, heat from a fire).

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#### 1. Heated air rises through Earth’s atmosphere.
✔ Convection
Explanation: Warm air becomes less dense and rises, while cooler air sinks — this is a classic example of convection currents in the atmosphere.

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#### 2. An ice cube melts when dropped into a glass of warm water.
✔ Conduction
Explanation: The heat from the warm water transfers directly to the ice cube through contact, causing it to melt.

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#### 3. Light leaves the sun and 8 minutes later strikes Earth.
✔ Radiation
Explanation: Sunlight travels through the vacuum of space via electromagnetic waves (no medium needed), which is radiation.

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#### 4. You burn your tongue eating hot pizza.
✔ Conduction
Explanation: The hot pizza makes direct contact with your tongue, transferring heat through conduction.

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#### 5. Hot magma rises inside Earth’s mantle, cools, and sinks.
✔ Convection
Explanation: This describes a convection current in the Earth’s mantle — hot material rises, cools, and then sinks back down.

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#### 6. A microwave oven heats soup.
✔ Radiation
Explanation: Microwaves are a form of electromagnetic radiation that excites water molecules in the soup, heating it. So, this is radiation.

> Note: While microwaves use electromagnetic waves, they’re not the same as infrared or visible light. But in this context, "radiation" refers to thermal radiation via EM waves, so it fits.

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#### 7. A fireplace warming a room.
✔ Radiation and Convection
But since the question asks for one type, the primary method is radiation (heat radiates from the flames and hot surfaces), but convection also plays a role (warm air rises).
However, most worksheets consider radiation as the dominant mode here because you feel warmth even without air movement (like on your skin).

So, ✔ Radiation is the best single answer.

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8. Draw an arrow to show the direction of air movement between A and B.

We have a temperature diagram:

```
28 26 24 23
A 26 26 24 23
26 25 24 22
B
```

- Point A is at 28°C (top-left corner)
- Point B is at 22°C (bottom-right corner)

Air moves from warmer areas to cooler areas due to convection.

So:
- Warm air at A rises.
- Cooler air at B sinks.
- Air will flow from A toward B (horizontally and vertically), creating a circulation.

👉 Draw an arrow from A to B (or more accurately, a curved arrow showing warm air rising from A and cool air moving in from B).

But since it's a simple diagram, just draw an arrow from A to B to indicate the general direction of air movement due to temperature differences.

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9. Like energy will totally move from areas of ________ to ________.

✔ Like energy will totally move from areas of high temperature to low temperature.

This is the Second Law of Thermodynamics — heat flows spontaneously from hotter to colder regions.

So, fill in:
> high temperature to low temperature

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✔ Final Answers:

1. Convection
2. Conduction
3. Radiation
4. Conduction
5. Convection
6. Radiation
7. Radiation
8. Arrow drawn from A to B (indicating movement from warmer to cooler region)
9. high temperature to low temperature

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Let me know if you'd like a visual sketch of the arrow or help formatting the worksheet!