Educational worksheet on energy forms and properties, featuring matching exercises and real-world examples.

Here's the complete solution to the worksheet, explained step by step:

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1. Join the type of energy with its definition.

We match each energy type with its correct scientific definition.

✔ Heat energy → *Sun, lava or fire emit this type of energy.*
→ Heat energy is thermal energy transferred due to temperature differences. Sun, lava, and fire are classic sources of heat.

✔ Chemical energy → *It is stored in food and fuels.*
→ Chemical energy is potential energy stored in the bonds of chemical compounds. Food and gasoline/fuels release this energy when burned or metabolized.

✔ Nuclear energy → *It is the energy inside the nucleus of an atom.*
→ Nuclear energy comes from the binding energy within atomic nuclei, released during fission or fusion.

✔ Light energy → *Sun and lightnings emit this type of energy.*
→ Light (or radiant) energy is electromagnetic radiation. The sun emits visible light; lightning emits intense bursts of light.

✔ Mechanical energy → *It is associated with the motion and position of an object.*
→ Mechanical energy = kinetic energy (motion) + potential energy (position/height). A moving bike or a raised weight has mechanical energy.

✔ Electrical energy → *It is associated with the presence and motion of electrical charges.*
→ Electrical energy is the energy carried by moving electrons (current) or stored in electric fields.

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2. Name the properties of the energy.

This question asks for the general properties of energy — not specific types, but universal characteristics.

The main properties of energy are:

✔ Conservation — Energy cannot be created or destroyed, only transformed or transferred (Law of Conservation of Energy).

✔ Transferability — Energy can move from one object or system to another (e.g., heat from stove to pot).

✔ Transformability — Energy can change from one form to another (e.g., chemical → kinetic → heat).

✔ Measurability — Energy can be measured in units like joules (J), calories, kilowatt-hours, etc.

*(Note: Some curricula may list “can do work” or “has mass equivalence via E=mc²” — but for elementary/middle school level, the 4 above are standard.)*

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3. Identify the property of the energy that is used in each case.

This question asks which property of energy is demonstrated in each scenario — meaning, which general characteristic (from Q2) is being shown.

Let’s analyze each:

✔ When riding your bike, you move your legs to move the pedals and then the bike.
→ This shows transformation: Chemical energy (in your muscles) → Mechanical energy (movement of bike).
➡️ Answer: Transformability

✔ When you eat to have energy for later.
→ This shows storage: Chemical energy is stored in food for future use.
➡️ Answer: Storage / Potential (but since "storage" isn't listed as a core property, best fit is Transformability — because it will later transform into usable energy)
*However, if we interpret “property” as how energy behaves — storing energy for later use relates to its ability to be stored as potential energy, which is part of Transformability.*
➡️ Better answer: Transformability *(since stored chemical energy will transform into kinetic/heat later)*

✔ When you plug your TV cable into the socket.
→ This shows transfer: Electrical energy is transferred from the outlet to the TV.
➡️ Answer: Transferability

✔ When you turn on your car and it uses the fuel to move.
→ This shows transformation: Chemical energy (fuel) → Thermal → Mechanical energy (car movement).
➡️ Answer: Transformability

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## ✔ Final Answers:

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1. Matching:

- Heat energy → Sun, lava or fire emit this type of energy.
- Chemical energy → It is stored in food and fuels.
- Nuclear energy → It is the energy inside the nucleus of an atom.
- Light energy → Sun and lightnings emit this type of energy.
- Mechanical energy → It is associated with the motion and position of an object.
- Electrical energy → It is associated with the presence and motion of electrical charges.

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2. Properties of energy:

> Conservation, Transferability, Transformability, Measurability

*(You can write them in any order.)*

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3. Identify the property:

- When riding your bike... → Transformability
- When you eat to have energy for later → Transformability *(stored energy transforms later)*
- When you plug your TV cable into the socket → Transferability
- When you turn on your car... → Transformability

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💡 Tip for students: Energy is never “used up” — it just changes form or moves from place to place. That’s why conservation and transformation are key ideas!

Let me know if you’d like a printable version or flashcards for these concepts!