Cambridge IGCSE 0625: Mass, Weight & Density Calculations | Tutolia Study Library

Understand the difference between mass and weight, gravitational field strength g, and measuring solid and liquid density for IGCSE Physics.

Subject: Physics | Grade Level: Grade 9-10 (IGCSE) | Curriculum: Cambridge IGCSE

Cambridge IGCSE: Mass, Weight & Density Calculations (Physics)

Syllabus Code: 0625 · Topic Code: 1.3 · Level: Grade 9-10 (IGCSE)

Aligned with official Cambridge IGCSE examination standards and assessment objectives.

🎯 Official Syllabus Learning Objectives

Candidates should be able to:

[x] Distinguish between mass (property resisting acceleration) and weight (gravitational force)
[x] Recall and use the equation W = mg
[x] Recall and apply the density formula rho = mass / volume

📐 Essential Formulas & Mathematical Equations

W = m \cdot g

\rho = \frac{m}{V}

💡 Conceptual Breakdown & Core Revision Notes

Mastering Mass, Weight & Density Calculations is critical for scoring Grade 9 / A* in Cambridge IGCSE Physics. When preparing for exam papers, examiners prioritize precise definitions, proper scientific command-word execution (State, Describe, Explain, Evaluate), and dimensional unit consistency.

Methodical Problem-Solving Framework

List Given Variables: Write down all given quantities with their respective SI units and identify the target variable.
Standardise Units: Always convert non-standard units (e.g. grams to kilograms, centimeters to meters, cm³ to dm³, hours to seconds).
State the Base Formula: Always state the general equation explicitly before substituting numbers to secure method marks.
State Final Value with Units: Quote your final calculated value to the required number of significant figures (typically 2 or 3 significant figures in Cambridge & IB) followed by the correct unit.

⚠️ Examiner Warnings & Common Student Pitfalls

Chief Examiner Advice:

Mass remains identical anywhere in the universe (in kg). Weight changes depending on gravitational field strength (in Newtons).

📝 Worked Exam Exemplar (Mark Scheme Breakdown)

Question:

A stone of mass 240 g is dropped into a cylinder containing 50 cm³ of water. The water level rises to 80 cm³. Calculate the density of the stone.

Model Answer & Marking Rubric:

Volume = 80 - 50 = 30 cm³. Density = mass / volume = 240 g / 30 cm³ = 8.0 g/cm³ (or 8000 kg/m³).

🧠 Rapid Active-Recall Study Deck (Spaced Repetition)

Test your immediate retention before leaving this page:

Question: What is the fundamental definition associated with Mass, Weight & Density Calculations?

Answer: Check the primary learning objective in the checklist above.

Question: Which governing formula links the main physical quantities in this topic?

Answer: `W = m \cdot g`.

Question: What classic trap do examiners frequently set on this topic?

Answer: Mass remains identical anywhere in the universe (in kg). Weight changes depending on gravitational field strength (in Newtons).