2.07 Help Worksheet | PDF - Free Printable

Let’s go through each question one by one and think about what energy is being changed into what.

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1. A battery in a flashlight

A battery stores chemical energy. When you turn on the flashlight, that chemical energy turns into light energy (and also some heat, but the main useful output is light).

So:
→ Chemical → Light

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4. A baseball being hit by a bat

Before the bat hits it, the ball might be moving — that’s kinetic energy. The bat is also moving — more kinetic energy. When they collide, the ball changes direction and speed — still kinetic energy! But wait — there’s also sound when the bat hits the ball (“crack!”), and maybe a little heat from friction.

But the main conversion here is:
The kinetic energy of the bat transfers to the ball — so it’s still kinetic to kinetic? Actually, no — we’re looking at *conversion*, not just transfer.

Actually, think deeper:
When the bat hits the ball, some of the kinetic energy becomes sound energy (you hear the hit) and thermal energy (the ball and bat warm up slightly). But the biggest change is that the ball gains kinetic energy from the bat — which is still kinetic.

Wait — let’s reframe:
The player uses muscles (chemical energy) to swing the bat (kinetic), then the bat hits the ball — converting some of that kinetic energy into sound and heat, but mostly transferring kinetic energy to the ball.

But the question says “a baseball being hit” — meaning the moment of impact. At that moment, kinetic energy (from bat and ball) is converted partly into sound and thermal energy.

However, many textbooks simplify this as:
Kinetic energy (bat) → Kinetic energy (ball) + Sound + Thermal

But since the blank asks for “converted into ___ energy”, and only two blanks, likely they want:

→ Kinetic → Sound and Thermal? Or maybe just Kinetic → Kinetic? That doesn’t make sense for “conversion”.

Actually, standard answer for this type of question:
When a bat hits a ball, kinetic energy is converted into sound energy and thermal energy — because the collision causes vibration (sound) and friction (heat).

But sometimes they say:
The stored energy in the player’s body (chemical) becomes kinetic in the bat, then upon hitting, becomes sound and heat.

But the question says: “A baseball being hit by a baseball bat” — focusing on the hit itself.

Best simple answer:
→ Kinetic → Sound and Thermal

But let’s check common curriculum answers — often they say:

“Kinetic energy is converted to sound and thermal energy during the collision.”

Yes.

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3. A match being lit

A match has chemicals on its head. When you strike it, friction creates heat, which starts a chemical reaction — burning. So:

Chemical energy (in the match head) → Thermal energy (heat) and Light energy (flame)

So:
→ Chemical → Thermal and Light

But again, two blanks — probably they want the main outputs.

Standard answer:
→ Chemical → Thermal and Light

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2. Turning on the TV

TV runs on electricity → so electrical energy goes in.

What comes out? You see pictures → light energy. You hear sound → sound energy. Also, TVs get warm → thermal energy, but usually they focus on light and sound.

So:
→ Electrical → Light and Sound

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5. Sunlight shining on solar panels

Sunlight = light energy (or radiant energy, but in their list it’s “Light”).

Solar panels convert light into electrical energy.

Then, when you turn on a lamp using that electricity, electrical energy becomes light energy again (and some heat).

So:
→ Light → Electrical → Light

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Now let’s write all answers clearly:

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Final Answer:

1. Chemical, Light
2. Electrical, Light, Sound
3. Chemical, Thermal and Light (but since two blanks, likely "Thermal" and "Light" — but format may vary; if only one word per blank, perhaps "Thermal" first, then "Light") — actually, looking at the sentence: “converted into ______ energy.” — singular? Wait, no — in #2 it says “both ___ and ___ energy”, so two words allowed. In #3 it says “into ______ energy” — one blank? Let me check original.

Looking back at user input:

In #1: “______ energy being converted into ______ energy.” → two blanks

#4: same → two blanks

#3: “______ energy being converted into ______ energy.” → two blanks

#2: “______ energy being converted into both ______ and ______ energy.” → three blanks total

#5: “______ energy being converted into ______ energy. This energy is then transferred into ______ energy...” → three blanks

So for #3, it's two blanks: first is input, second is output — but output could be compound? No, likely they expect one type per blank. But a match produces both heat and light. Hmm.

Actually, in many curricula, for a match, they say:

Chemical → Thermal (primary) and Light (secondary) — but since only one output blank, perhaps they accept “Thermal and Light” as one phrase? Unlikely.

Wait — look at #2: it explicitly says “both ___ and ___”, so for others, if only one blank for output, maybe they expect the primary form.

For a match, the main purpose is to produce flame — which is light and heat. But often, “thermal” is emphasized.

Alternatively, perhaps “radiant” — but not in their list.

Their list: Potential, Kinetic, Chemical, Electrical, Nuclear, Thermal, Sound, Light.

So for match: Chemical → Thermal and Light — but how to fit in one blank? Maybe the question allows multiple words? Looking at layout, probably each blank is for one word.

This is ambiguous. Let me think like a 5th grader.

Common answer I’ve seen:
Match: Chemical → Thermal (because fire feels hot) — but also gives light.

Perhaps in this context, since flashlight was chemical→light, and match is similar, but match is more about starting fire → thermal.

I recall: In many worksheets, “striking a match” is chemical to thermal and light — and if forced to pick one for output, they might say “thermal” because the light is secondary.

But let’s see question #5: sunlight → solar panel → electricity → lamp → light. So they distinguish.

Another idea: perhaps for #3, they want “Chemical” to “Thermal” — assuming the light is part of thermal radiation? Not accurate.

Better to check standard answers online or logically.

Upon second thought: when you light a match, the chemical energy is converted primarily to thermal energy (heat) which then produces light. But the direct conversion is chemical to thermal and electromagnetic (light).

Since their list includes both, and the blank is singular, perhaps the worksheet expects “Thermal” as the main output, or maybe “Light”.

Wait — look at the image: it shows a match with flame — so both are visible.

But in the text, for #2, they have “both ___ and ___”, implying that for others, if not specified, maybe one output.

This is tricky. Let me assume that for #3, since it’s “converted into ______ energy”, and only one blank, they might expect the most obvious — which is Thermal, because matches are used to create heat/fire.

But I think it’s safer to put “Thermal and Light” if possible, but the format may not allow.

Looking at the user’s copy-paste:

“3. A match being lit is an example of __________ energy being converted into __________ energy.”

Two separate blanks. So likely, first blank: Chemical, second blank: ?

If I must choose one, I’d say Thermal, because the light is a byproduct, and thermal is the intended effect for lighting fires.

But let’s see what makes sense with the rest.

Perhaps in some curricula, they say chemical to light for match — like flashlight.

I found a better way: think about what the energy is used for. Flashlight: to see → light. Match: to start fire → heat → thermal.

So for match: Chemical → Thermal

For flashlight: Chemical → Light

That makes sense.

Similarly, for baseball hit: the energy conversion during impact is kinetic to sound and thermal — but since only one output blank, perhaps they want “Sound” or “Thermal”? But in #4, it’s “converted into ______ energy” — one blank.

Same issue.

For #4: “A baseball being hit by a baseball bat is an example of ______ energy being converted into ______ energy.”

Input: Kinetic (from bat and ball motion)

Output: During collision, kinetic energy is transformed into sound and thermal — so if one blank, which one? Probably “Sound” because you hear it, or “Thermal” because of friction.

But commonly, it’s listed as kinetic to sound and thermal.

Given that in #2 they have “both”, for others they might expect the primary non-kinetic output.

To resolve, let's use the most accepted answers from educational resources:

- Battery in flashlight: Chemical → Light
- Baseball hit: Kinetic → Sound (or Thermal, but Sound is more noticeable)
- Match lit: Chemical → Thermal
- TV: Electrical → Light and Sound
- Solar panels: Light → Electrical → Light

For baseball, many sources say: "When a bat hits a ball, kinetic energy is converted to sound energy and thermal energy." Since only one blank, perhaps they expect "Sound" as it's audible.

But let's look for consistency.

Another approach: in the list, "Sound" is included, and for baseball hit, sound is produced, so likely "Sound".

Similarly for match, "Thermal" is produced.

I think that's reasonable.

So final decisions:

1. Chemical, Light
2. Electrical, Light, Sound
3. Chemical, Thermal
4. Kinetic, Sound (or Thermal? Let's say Sound, as it's distinctive)
5. Light, Electrical, Light

But for #4, is the input kinetic? Yes, the bat and ball have kinetic energy before hit. After hit, the ball has kinetic energy too, but the conversion is to other forms during the collision.

The question is: "being converted into" — implying the energy that is transformed, not transferred.

So during the hit, some kinetic energy is lost to sound and heat — so converted to those.

So output should be Sound or Thermal.

I think "Sound" is fine.

Some might argue "Thermal", but sound is more specific to the event.

Let's go with:

1. Chemical, Light
2. Electrical, Light, Sound
3. Chemical, Thermal
4. Kinetic, Sound
5. Light, Electrical, Light

But for #5, the last part: "this energy is then transferred into ______ energy when we turn on a lamp." — "transferred" might mean converted, so electrical to light.

Yes.

Now, to confirm, let's write them as per blanks.

Final Answer:

1. Chemical, Light
2. Electrical, Light, Sound
3. Chemical, Thermal
4. Kinetic, Sound
5. Light, Electrical, Light

I think that's consistent and appropriate for a school level.