Momentum (GCSE) — GCSE Physics Revision
Revise Momentum (GCSE) 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), SQA, IB, AP.
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Go to Forces & ElasticityWhat is Momentum (GCSE)?
Momentum is a measure of an object's motion, defined as the product of its mass and velocity (p=mv). It is a vector quantity, meaning it has both magnitude and direction. The principle of conservation of momentum states that in a closed system, the total momentum before a collision or explosion is equal to the total momentum after.
Board notes: A Higher Tier topic for all major GCSE Physics boards (AQA, Edexcel, OCR). Conservation of momentum calculations are a common feature of exams.
Step-by-step explanationWorked example
A 5kg trolley moving at 2 m/s collides with a stationary 3kg trolley. They stick together. What is their velocity after the collision? Solution: Total momentum before = (5kg x 2 m/s) + (3kg x 0 m/s) = 10 kg m/s. Total mass after = 5kg + 3kg = 8kg. Total momentum after = 8kg x v. By conservation of momentum, 10 = 8v, so v = 10/8 = 1.25 m/s.
Mini lesson for Momentum (GCSE)
1. Understand the core idea
Momentum is a measure of an object's motion, defined as the product of its mass and velocity (p=mv). It is a vector quantity, meaning it has both magnitude and direction.
Can you explain Momentum (GCSE) without copying the notes?
2. Turn it into marks
A 5kg trolley moving at 2 m/s collides with a stationary 3kg trolley. They stick together.
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: Confusing momentum with kinetic energy. They are related but different concepts. Momentum is always conserved in a collision, but kinetic energy is only conserved in an elastic collision.
Write one correction rule before doing another practice question.
Practise this topic
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Momentum (GCSE) practice questions
These are original StudyVector questions for revision practice. They are not official exam-board questions.
Question 1
In one GCSE sentence, explain what Momentum (GCSE) is testing.
Answer: Momentum is a measure of an object's motion, defined as the product of its mass and velocity (p=mv). It is a vector quantity, meaning it has both magnitude and direction.
Mark focus: Precise definition and topic focus.
Question 2
A Momentum (GCSE) 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: "Confusing momentum with kinetic energy. They are related but different concepts. Momentum is always conserved in a collision, but kinetic energy is only conserved in an elastic collision." What should their next repair task be?
Answer: Do one Momentum (GCSE) question and review the mistake type.
Mark focus: Error correction and next-step practice.
Momentum (GCSE) flashcards
Core idea
What is the main idea in Momentum (GCSE)?
Momentum is a measure of an object's motion, defined as the product of its mass and velocity (p=mv). It is a vector quantity, meaning it has both magnitude and direction.
Common mistake
What mistake should you avoid in Momentum (GCSE)?
Confusing momentum with kinetic energy. They are related but different concepts.
Practice
What is one useful practice task for Momentum (GCSE)?
Answer one Momentum (GCSE) question and review the mistake type.
Exam board
How should you use board notes for Momentum (GCSE)?
A Higher Tier topic for all major GCSE Physics boards (AQA, Edexcel, OCR). Conservation of momentum calculations are a common feature of exams.
Common mistakes
- 1Confusing momentum with kinetic energy. They are related but different concepts. Momentum is always conserved in a collision, but kinetic energy is only conserved in an elastic collision.
- 2Forgetting that momentum is a vector. The direction of motion is crucial. When objects are moving in opposite directions, one velocity must be treated as negative.
- 3Using the wrong units. Momentum is measured in kilogram metres per second (kg m/s).
Momentum (GCSE) exam questions
Exam-style questions for Momentum (GCSE) with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP specifications.
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Momentum (GCSE)
Core concept
Momentum is a measure of an object's motion, defined as the product of its mass and velocity (p=mv). It is a vector quantity, meaning it has both magnitude and direction. The principle of conservation…
Frequently asked questions
What is the conservation of momentum?
The principle of conservation of momentum states that for a system of interacting objects, the total momentum remains constant, provided no external forces act on the system. This is particularly useful for analysing collisions and explosions.
What is impulse?
Impulse is the change in momentum of an object. It is equal to the force applied multiplied by the time the force acts for (Impulse = FΔt = Δp). This is why safety features like airbags and crumple zones work - they increase the time of impact, which reduces the force.