GCSE Physics Revision — Weight & Mass
Revise Weight & Mass for GCSE Physics. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), Pearson Edexcel International, OxfordAQA International, SQA, IB, AP.
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- Weight & Mass in GCSE Physics: explanation, examples, and practice links on this page.
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What is Weight & Mass?
Mass is the amount of matter in an object, measured in kilograms (kg). It is a scalar quantity and is the same everywhere. Weight is the force of gravity acting on an object, measured in Newtons (N). It is a vector quantity and depends on the gravitational field strength (g). The formula linking them is Weight = Mass x Gravitational Field Strength (W=mg).
Board notes: A fundamental distinction required by all GCSE Physics boards (AQA, Edexcel, OCR).
Step-by-step explanationWorked examples
Worked example 1: Core method
An astronaut has a mass of 80kg. The gravitational field strength on Earth is 9.8 N/kg and on the Moon is 1.6 N/kg. Calculate her weight on Earth and on the Moon. Solution: Weight on Earth = 80kg x 9.8 N/kg = 784 N. Weight on the Moon = 80kg x 1.6 N/kg = 128 N.
Worked example 2: Exam variation
Now change one detail in the question and keep the same structure: name the Weight & Mass idea being tested, show the method or evidence, then explain why it answers the command word. This helps GCSE Physics students avoid memorising one surface pattern.
Worked example 3: Mark-scheme check
Finish by checking the answer against marks: one point for the correct Weight & Mass idea, one for accurate working or evidence, and one for a precise final statement. If any step is vague, rewrite it before moving to timed practice.
Mini lesson for Weight & Mass
1. Understand the core idea
Mass is the amount of matter in an object, measured in kilograms (kg). It is a scalar quantity and is the same everywhere.
Can you explain Weight & Mass without copying the notes?
2. Turn it into marks
An astronaut has a mass of 80kg. The gravitational field strength on Earth is 9.
Underline the method, evidence, or command-word move that would earn credit in GCSE Forces.
3. Fix the likely mark leak
Watch for this mistake: Using the terms mass and weight interchangeably. They are different quantities. Mass is a measure of inertia, while weight is a force.
Write one correction rule before doing another practice question.
Practise this topic
Start with low-focus cards for Weight & Mass, then move into full exam-style practice when you want the heavier session.
Mini quiz: Weight & Mass
Three quick checks for revision practice. They are original StudyVector prompts, not official exam-board questions.
Question 1
In one GCSE sentence, explain what Weight & Mass is testing.
Answer: Mass is the amount of matter in an object, measured in kilograms (kg). It is a scalar quantity and is the same everywhere.
Mark focus: Precise definition and topic focus.
Question 2
A Weight & Mass question uses an unfamiliar context. What should the answer do before adding detail?
Answer: It should name the process, variable, equation, particle model, or evidence being tested, then explain the result using precise scientific vocabulary.
Mark focus: Method selection and command-word control.
Question 3
A student makes this mistake: "Using the terms mass and weight interchangeably. They are different quantities. Mass is a measure of inertia, while weight is a force." What should their next repair task be?
Answer: Do one Weight & Mass question and review the mistake type.
Mark focus: Error correction and next-step practice.
Weight & Mass flashcards
Core idea
What is the main idea in Weight & Mass?
Mass is the amount of matter in an object, measured in kilograms (kg). It is a scalar quantity and is the same everywhere.
Common mistake
What mistake should you avoid in Weight & Mass?
Using the terms mass and weight interchangeably. They are different quantities.
Practice
What is one useful practice task for Weight & Mass?
Answer one Weight & Mass question and review the mistake type.
Exam board
How should you use board notes for Weight & Mass?
A fundamental distinction required by all GCSE Physics boards (AQA, Edexcel, OCR).
Common mistakes
- 1Using the terms mass and weight interchangeably. They are different quantities. Mass is a measure of inertia, while weight is a force.
- 2Forgetting that weight changes depending on the gravitational field strength. An object has the same mass on Earth and the Moon, but its weight is much less on the Moon.
- 3Using the wrong units. Mass is in kg, weight is in N, and gravitational field strength is in N/kg.
Weight & Mass exam questions
Exam-style questions for Weight & Mass with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), Pearson Edexcel International, OxfordAQA International, SQA, IB, AP specifications.
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Weight & Mass
Core concept
Mass is the amount of matter in an object, measured in kilograms (kg). It is a scalar quantity and is the same everywhere. Weight is the force of gravity acting on an object, measured in Newtons (N). …
Frequently asked questions
What is the difference between mass and weight?
Mass is the amount of 'stuff' in an object and is measured in kg. Weight is the force of gravity on that object and is measured in N. Your mass is constant, but your weight can change.
What is the value of g on Earth?
The gravitational field strength, g, on the surface of the Earth is approximately 9.8 N/kg. For simplicity in GCSE calculations, it is often rounded to 10 N/kg.