P.4 Mass and Weight online exercise for - Free Printable

Let's solve the worksheet step by step and explain each part.

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Title: Mass and Weight

This worksheet helps students understand the difference between mass and weight, two related but distinct concepts in science.

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Part 1: Definitions

#### Mass
- Definition: The amount of matter in an object.
- Measured in: kilograms (kg)

> ✔ So, fill in:
> - "the amount of matter"
> - "measured in kilograms"

#### Weight
- Definition: How much force an object exerts due to gravity (i.e., how much it is pulled by gravity).
- Measured in: newtons (N)

> ✔ So, fill in:
> - "How much force" (or "gravity pulls on an object")
> - "measured in newtons"

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Part 2: Earth vs. Moon Diagrams

We are shown two figures:
- One standing on Earth
- One standing on the Moon

Both have a mass of 48 kg, but different weights because gravity differs.

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#### On Earth:
- Mass = 48 kg
- Weight = 480 N

> This means that the force of gravity pulling the person down on Earth is 480 newtons.

> ✔ Fill in:
> - Mass = 48 kg
> - Weight = 480 N

#### On the Moon:
- Mass = 48 kg → Mass doesn't change with location!
- Weight = ? But we're told the weight is 480 N? Wait — that can't be right.

Wait! There’s a problem here.

Let’s check:

The same person has:
- Mass = 48 kg (on both Earth and Moon)
- On Earth, weight ≈ 480 N → That makes sense because:
$$
\text{Weight} = \text{mass} \times \text{gravity}
$$
$$
48\,\text{kg} \times 10\,\text{m/s}^2 = 480\,\text{N}
$$
(Using approximate gravity on Earth: 10 m/s²)

But on the Moon, gravity is about 1/6th of Earth’s → around 1.6 m/s²

So:
$$
\text{Weight on Moon} = 48\,\text{kg} \times 1.6\,\text{m/s}^2 = 76.8\,\text{N}
$$

But the worksheet says:
> ________ = 480 N (for the Moon)

That would mean the weight is 480 N on the Moon — which is not correct if mass is 48 kg.

Wait — let's re-read the labels.

Look at the boxes:

Earth side:
- ________ = 48 kg
- ________ = 480 N

Moon side:
- ________ = 48 kg
- ________ = 480 N

That suggests both have 480 N weight — which is impossible unless the person is heavier or gravity is same.

But the diagram shows same person, so mass must be same.

So likely, there is a mistake in the worksheet, or perhaps it's intentionally misleading to teach a concept.

But wait — look again.

It says:
- On Earth: ______ = 48 kg → this must be mass
- On Earth: ______ = 480 N → this must be weight

Then on Moon:
- ______ = 48 kg → again, mass (same as Earth)
- ______ = 480 N → weight?

But that can't be — unless gravity on Moon is same as Earth — which it isn’t.

So either:
1. The weight on Moon should be less, like ~77 N
2. Or the value 480 N is a typo, and it should be smaller.

But maybe the intention is just to label what is what.

Let’s assume the numbers are correct for teaching purposes.

But actually — let’s think differently.

Wait — could it be that the person has 48 kg mass, and on Earth, their weight is 480 N, which is correct (using g = 10 m/s²).

Now, on the Moon, mass is still 48 kg, but weight is less — say around 77 N.

But the worksheet says:
> ________ = 480 N (on Moon)

That can't be.

So probably, the number 480 N is incorrect for the Moon.

Alternatively, perhaps the labeling is mixed up.

But looking at the layout:

Earth:
- [blank] = 48 kg → this is mass
- [blank] = 480 N → this is weight

Moon:
- [blank] = 48 kg → mass (same)
- [blank] = 480 N → weight?

But that implies same weight on Moon and Earth — which is false.

So the only logical conclusion is: the 480 N on the Moon is a mistake.

But maybe the worksheet wants us to fill in the terms, not correct the values.

Let’s go back.

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✔ Correct Way to Fill In:

#### Earth Side:
- Mass = 48 kg
- Weight = 480 N

#### Moon Side:
- Mass = 48 kg → same
- Weight = ??? → should be less, but given as 480 N → error

But since the worksheet says:
> ________ = 480 N (on Moon)

And we know weight changes with gravity, but mass does not, then:

→ The 480 N on Moon is incorrect.

But perhaps the worksheet intends for students to realize that mass is constant, while weight varies.

So the correct way to complete the blanks is:

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✔ Final Answer:

#### Definitions:

Mass:
- the amount of matter
- measured in kilograms (kg)

Weight:
- How much force (or gravity pulls on an object)
- measured in newtons (N)

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#### Earth:
- Mass = 48 kg
- Weight = 480 N

#### Moon:
- Mass = 48 kg
- Weight = ? → But worksheet says 480 N → Incorrect

But since the worksheet says:
> ________ = 480 N (on Moon)

Then we must assume it's a typo, or perhaps they meant to show that weight is the same (which is wrong), but instead, we should correctly identify the terms.

So the correct filling is:

> Earth:
> - Mass = 48 kg
> - Weight = 480 N

> Moon:
> - Mass = 48 kg
> - Weight = ?? → But it's not 480 N, so the value 480 N is likely a mistake

But if we follow the worksheet exactly:

> On Moon:
> - ________ = 48 kg → Mass
> - ________ = 480 N → Weight (but this is wrong physically)

However, for educational purposes, the goal is to identify the quantity.

So:

✔ Answer Key:

| Blank | Answer |
|------|--------|
| Mass: the amount of ______ | matter |
| Mass: measured in ______ | kilograms |
| Weight: How much ______ | force (or "gravity pulls") |
| Weight: measured in ______ | newtons |
| Earth: ______ = 48 kg | Mass |
| Earth: ______ = 480 N | Weight |
| Moon: ______ = 48 kg | Mass |
| Moon: ______ = 480 N | Weight |

⚠️ Note: The weight on the Moon cannot be 480 N if the mass is 48 kg. It should be about 77 N. So the value 480 N on the Moon is incorrect.

But since the worksheet presents it that way, we assume it's a teaching tool to label, not a realistic scenario.

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🌍 Summary:

- Mass is the amount of matter, stays the same everywhere → 48 kg on Earth and Moon.
- Weight depends on gravity → changes from place to place.
- On Earth: 48 kg × 10 m/s² = 480 N
- On Moon: 48 kg × 1.6 m/s² ≈ 77 N

So the 480 N on the Moon is incorrect.

But for the worksheet:

> ✔ Fill in:
>
> Mass:
> - the amount of matter
> - measured in kilograms
>
> Weight:
> - How much force
> - measured in newtons
>
> Earth:
> - Mass = 48 kg
> - Weight = 480 N
>
> Moon:
> - Mass = 48 kg
> - Weight = 480 N ← (Note: This is scientifically inaccurate)

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✔ Final Answer (as per worksheet):

> Mass:
> - the amount of matter
> - measured in kilograms
>
> Weight:
> - How much force
> - measured in newtons
>
> Earth:
> - Mass = 48 kg
> - Weight = 480 N
>
> Moon:
> - Mass = 48 kg
> - Weight = 480 N

⚠️ Educational Note: While the labeling is correct, the value 480 N on the Moon is incorrect. Weight on the Moon should be about 77 N for a 48 kg person. This may be a typo or oversight in the worksheet.

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Let me know if you'd like a corrected version of the worksheet!