Physical Science worksheet focusing on energy transformations, asking students to identify the types of energy involved in various real-world scenarios.

Here’s the completed fill-in-the-blank worksheet with explanations for each energy transformation:

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1. A steam locomotive where coal burns to make steam which drives the locomotive down the track.

Chemical → Thermal → Mechanical

✔ Explanation:
- Coal contains chemical energy stored in its molecular bonds.
- When burned, it releases heat — this is thermal energy.
- The heat turns water into steam, which expands and pushes pistons — converting thermal energy into mechanical energy (motion of the train).

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2. The sun shines on a solar panel which drives a motor to strike a match.

Radiant → Electrical → Mechanical & Thermal

✔ Explanation:
- Sunlight is radiant energy (electromagnetic waves).
- Solar panels convert radiant energy into electrical energy.
- The motor uses electrical energy to move mechanically — mechanical energy — and when it strikes the match, friction creates heat (thermal energy) and ignites it.

*(Note: “&” indicates two forms produced at the end — mechanical motion + thermal ignition)*

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3. A wind turbine with storage batteries which provide electricity to a home.

Kinetic → Mechanical → Electrical → Chemical

✔ Explanation:
- Wind has kinetic energy (energy of motion).
- It spins the turbine blades — mechanical energy.
- The spinning turbine generates electrical energy via a generator.
- Batteries store that electricity as chemical energy (via electrochemical reactions) for later use.

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4. The telephone rings and you pick it up to hear someone and then you speak back to them.

Electrical → Sound → Electrical → Sound

✔ Explanation:
- Incoming call signal is electrical energy traveling through wires or wireless signals.
- Phone speaker converts it to sound energy (ringing).
- When you talk, your voice (sound) is converted by the microphone into electrical energy.
- That signal is sent to the other person, who hears it as sound energy again.

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5. You strike a match and it lights.

Mechanical → Thermal → Chemical

✔ Explanation:
- Striking the match involves mechanical energy (friction).
- Friction generates heat — thermal energy — which ignites the match head.
- Once lit, the chemical reaction in the match head releases more heat and light — chemical energy being converted (though technically, it’s chemical → thermal/light, but since we’re listing transformations *in sequence*, the initial trigger is mechanical → thermal → chemical reaction).

*Alternative view: Some may say Mechanical → Thermal → Radiant/Thermal — but since the question lists “chemical” as an option and the match head undergoes combustion (a chemical change), “chemical” fits as the final energy form being released.*

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6. A rock falls from a cliff.

Gravitational → Kinetic → Thermal/Sound

✔ Explanation:
- At the top, the rock has gravitational potential energy due to height.
- As it falls, that converts to kinetic energy (motion).
- When it hits the ground, kinetic energy is transformed into thermal energy (heat from impact) and sound energy (crash noise).

*(Note: Since only 3 blanks are given, and “thermal” and “sound” both occur, you might choose one — but “thermal” is most common. If allowed, write “Thermal & Sound” — but based on format, likely just “Thermal” or “Sound”. Best to go with Thermal, as it’s always present in collisions.)*

→ Final Answer: Gravitational → Kinetic → Thermal

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7. The human body takes food in and produces energy in 2 to 3 forms:

Chemical → Mechanical → Thermal
*(Optional 3rd: Chemical → Mechanical → Thermal & Radiant — but radiant is minimal)*

✔ Explanation:
- Food contains chemical energy.
- Body metabolizes it to power muscles — mechanical energy (movement).
- Much of the energy is lost as thermal energy (body heat).
- Very small amount may be emitted as radiant energy (infrared), but usually not listed unless specified.

→ Most standard answer: Chemical → Mechanical → Thermal

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8. A car is driving along and suddenly slams the brakes on and crashes into a metal pole.

Chemical → Kinetic → Thermal/Sound → Mechanical (deformation)

✔ Explanation:
- Gasoline (or battery) provides chemical energy → converted to kinetic energy (car moving).
- Braking converts kinetic to thermal energy (heat in brakes).
- Crashing into pole: kinetic energy becomes sound (crash noise), thermal (heat from friction/deformation), and mechanical energy (bending metal — deformation energy).

→ Since only 4 blanks, best sequence:
Chemical → Kinetic → Thermal → Sound
*(or Thermal → Mechanical if emphasizing deformation)*

But most accurate:
Chemical → Kinetic → Thermal & Sound — but since 4 blanks, perhaps:
Chemical → Kinetic → Thermal → Sound

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9. Burning wood in a fireplace.

Chemical → Thermal → Radiant

✔ Explanation:
- Wood stores chemical energy in its cellulose/lignin.
- Burning (combustion) releases thermal energy (heat).
- Also emits radiant energy (visible light and infrared radiation you feel as warmth).

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## ✔ Final Answers Summary:

1. Chemical → Thermal → Mechanical
2. Radiant → Electrical → Mechanical & Thermal
3. Kinetic → Mechanical → Electrical → Chemical
4. Electrical → Sound → Electrical → Sound
5. Mechanical → Thermal → Chemical
6. Gravitational → Kinetic → Thermal
7. Chemical → Mechanical → Thermal
8. Chemical → Kinetic → Thermal → Sound
9. Chemical → Thermal → Radiant

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Let me know if you’d like a printable version or diagrams to visualize these transformations!