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Mass and Weight Basics

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Mass and Weight Basics

Balance scale with various objects

📚 Part 1: Understanding Mass and Weight

1. What is the difference between mass and weight?

Mass and weight are exactly the same thing

Mass is the amount of "stuff" in an object, weight is the force of gravity on that mass

Weight is measured in grams, mass is measured in kilograms

Mass changes on different planets, weight stays the same

2. Which units do we use to measure mass in the metric system?

Grams (g)

Kilograms (kg)

Pounds (lb)

Ounces (oz)

3. How many grams are in 1 kilogram?

10 grams

100 grams

1000 grams

10,000 grams

4. Which object would you measure in grams rather than kilograms?

A car

A pencil

A bag of potatoes

A person

⚖️ Part 2: Choosing the Right Units

5. For each object, circle the most appropriate unit to measure its mass:

a) A textbook: grams or kilograms

b) A paperclip: grams or kilograms

c) A desktop computer: grams or kilograms

d) An apple: grams or kilograms

e) A bicycle: grams or kilograms

6. Convert these measurements:

a) 2500 g = _______ kg

b) 3.5 kg = _______ g

c) 750 g = _______ kg

d) 1.25 kg = _______ g

7. Estimate the mass of these everyday objects. Write your estimate and choose the appropriate unit:

a) A can of soft drink: _________ _____

b) A laptop computer: _________ _____

c) A banana: _________ _____

d) A backpack full of books: _________ _____

🧠 Part 3: Problem Solving

8. Sarah is baking a cake. The recipe calls for 250g of flour, 200g of sugar, and 100g of butter. What is the total mass of these ingredients in grams? Show your working.

Total mass = _______ g

9. Explain why it would be better to measure a feather in grams rather than kilograms. Use complete sentences.
10. Extension Challenge: If an object has a mass of 2.75 kg on Earth, would its mass be different on the Moon? Explain your reasoning.

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