Resultant Forces — GCSE Physics Revision
Revise Resultant Forces 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 Newton's Laws (GCSE)What is Resultant Forces?
The resultant force is the single force that has the same effect as all the other forces acting on an object combined. If the forces are balanced, the resultant force is zero and the object's motion does not change. If the forces are unbalanced, there is a resultant force, and the object will accelerate in the direction of that force.
Board notes: Covered by all major boards (AQA, Edexcel, OCR). Free-body force diagrams are a key skill to master.
Step-by-step explanationWorked example
A box is pushed with a force of 30N to the right, and a frictional force of 10N acts to the left. What is the resultant force? Solution: The forces are in opposite directions, so we subtract them. Resultant Force = 30N - 10N = 20N to the right.
Mini lesson for Resultant Forces
1. Understand the core idea
The resultant force is the single force that has the same effect as all the other forces acting on an object combined. If the forces are balanced, the resultant force is zero and the object's motion does not change.
Can you explain Resultant Forces without copying the notes?
2. Turn it into marks
A box is pushed with a force of 30N to the right, and a frictional force of 10N acts to the left. What is the resultant force?
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: Forgetting to consider the direction of the forces. Forces are vectors, so their directions are crucial. Forces in opposite directions are subtracted.
Write one correction rule before doing another practice question.
Practise this topic
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Resultant Forces 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 Resultant Forces is testing.
Answer: The resultant force is the single force that has the same effect as all the other forces acting on an object combined. If the forces are balanced, the resultant force is zero and the object's motion does not change.
Mark focus: Precise definition and topic focus.
Question 2
A Resultant Forces 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: "Forgetting to consider the direction of the forces. Forces are vectors, so their directions are crucial. Forces in opposite directions are subtracted." What should their next repair task be?
Answer: Do one Resultant Forces question and review the mistake type.
Mark focus: Error correction and next-step practice.
Resultant Forces flashcards
Core idea
What is the main idea in Resultant Forces?
The resultant force is the single force that has the same effect as all the other forces acting on an object combined. If the forces are balanced, the resultant force is zero and the object's motion does not change.
Common mistake
What mistake should you avoid in Resultant Forces?
Forgetting to consider the direction of the forces. Forces are vectors, so their directions are crucial.
Practice
What is one useful practice task for Resultant Forces?
Answer one Resultant Forces question and review the mistake type.
Exam board
How should you use board notes for Resultant Forces?
Covered by all major boards (AQA, Edexcel, OCR). Free-body force diagrams are a key skill to master.
Common mistakes
- 1Forgetting to consider the direction of the forces. Forces are vectors, so their directions are crucial. Forces in opposite directions are subtracted.
- 2Thinking that a zero resultant force means the object is stationary. It could be moving at a constant velocity (Newton's First Law).
- 3Incorrectly drawing force diagrams. The arrows should be labelled with the force name and magnitude, and their lengths should be roughly proportional to the force size.
Resultant Forces exam questions
Exam-style questions for Resultant Forces 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 Resultant Forces
Core concept
The resultant force is the single force that has the same effect as all the other forces acting on an object combined. If the forces are balanced, the resultant force is zero and the object's motion d…
Frequently asked questions
What happens if the resultant force on an object is zero?
If the resultant force is zero, the object will either remain at rest or continue to move at a constant velocity. Its acceleration is zero.
How do you find the resultant of two perpendicular forces?
You can find the resultant of two perpendicular forces by drawing a vector diagram and using Pythagoras' theorem and trigonometry to find the magnitude and direction of the resultant force.