15 3 Forms Of Energy Worksheets - Free PDF at worksheeto.com - Free Printable

Let's solve each energy transformation problem step by step. The goal is to:

1. Underline the key word or phrase that indicates a change in energy form.
2. Identify the sequence of energy transformations using the main forms:
*chemical, gravitational, elastic, nuclear, mechanical, electrical, sound, thermal, radiant.*
3. Fill in the boxes with the correct energy forms.

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1. A battery is placed in a flashlight, which completes a circuit, then produces light when turned to the on position.

- Key phrase: "produces light" → indicates radiant energy.
- Energy transformation:
- Battery stores chemical energy.
- When the circuit is completed, chemical energy → electrical energy.
- Electrical energy → radiant (light) energy.

✔ Answer:
Chemical → Electrical → Radiant

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2. A person standing on the edge of a diving board pushes down to bend the board, then bounces up.

- Key phrases: "pushes down to bend the board" → elastic deformation; "bounces up" → motion and height → gravitational potential energy.
- Energy transformation:
- Person uses mechanical energy (muscle work) to push down → bends the board → stores elastic potential energy.
- Board releases energy → converts to kinetic (mechanical) energy as person bounces up.
- As person rises, kinetic → gravitational potential energy.

But we are asked for three forms. Let’s trace it clearly:
1. Mechanical (from person pushing)
2. Elastic (stored in bent board)
3. Gravitational (as person gains height)

✔ Answer:
Mechanical → Elastic → Gravitational

> Note: The initial energy comes from the person’s muscles (chemical), but the transformation starts when they push — so mechanical is appropriate here.

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3. A battery powers a phone that chimes when turned on.

- Key phrase: "chimes" → sound energy.
- Energy transformation:
- Battery has chemical energy.
- Chemical → electrical energy (through circuit).
- Electrical → sound energy (speaker produces chime).

✔ Answer:
Chemical → Electrical → Sound

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4. A rotating turbine generates electricity to power a water pump.

- Key phrases: "rotating turbine" → mechanical energy; "generates electricity" → electrical; "powers a water pump" → moves water → mechanical again.
- Energy transformation:
- Turbine rotates → mechanical energy.
- Mechanical → electrical energy (via generator).
- Electrical → mechanical energy (pump moves water).

✔ Answer:
Mechanical → Electrical → Mechanical

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5. A solar panel generates electricity to fill up the battery.

- Key phrases: "solar panel" → absorbs sunlight → radiant energy; "generates electricity" → electrical; "fill up the battery" → stores chemical energy.
- Energy transformation:
- Sunlight (radiant energy) → converted by solar panel → electrical energy.
- Electrical energy stored in battery → becomes chemical energy.

✔ Answer:
Radiant → Electrical → Chemical

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✔ Final Answers:

| Sentence | Energy Transformation |
|--------|-----------------------|
| 1. Flashlight | Chemical → Electrical → Radiant |
| 2. Diving board | Mechanical → Elastic → Gravitational |
| 3. Phone chimes | Chemical → Electrical → Sound |
| 4. Turbine & pump | Mechanical → Electrical → Mechanical |
| 5. Solar panel | Radiant → Electrical → Chemical |

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🔍 Explanation Summary:

- Chemical energy: Stored in batteries, food, fuel.
- Mechanical energy: Motion or position (kinetic + potential).
- Elastic energy: Stored in stretched or compressed objects (like a bent board).
- Gravitational energy: Due to height above Earth.
- Electrical energy: Flow of electrons in circuits.
- Radiant energy: Light or electromagnetic waves.
- Sound energy: Vibrations through a medium.
- Thermal energy: Heat (not used here, but common in other cases).

Each transformation follows the law of conservation of energy — energy changes form but is not destroyed.

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