OCR A Level Physics A
OCR A Level Physics A Forces in Action Exam Questions
Free OCR A Level Physics A exam questions on Forces in Action, with mark schemes. Covers free-body diagrams, drag, terminal velocity, moments, couples, density and pressure.
Forces in Action exam questions
1 question pack of real past exam questions with its mark scheme. Answer every question without notes, then mark your answers line by line against the mark scheme.
StemUp mark scheme flashcards
OCR A Level Physics A H556 Flashcards (Anki & Quizlet)
Every answer is written in mark scheme wording, so you learn exactly what examiners give marks for. Use them on Anki or Quizlet, then test yourself with the questions on this page.
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About OCR A Level Physics A Forces in Action
This topic covers forces and equilibrium.
What you need to know
- Forces Weight, friction, drag, tension and upthrust.
- Terminal velocity Drag balances weight.
- Equilibrium Moments, couples and triangle of forces.
- Pressure p = F/A, p = hρg and Archimedes' principle.
Common mistakes in Forces in Action
- Forgetting upthrust.
- Using wrong distance in moments.
- Saying terminal velocity means no forces.
Try three Forces in Action exam-style questions
1. Explain why a skydiver reaches terminal velocity. (2 marks)
Show the mark scheme answer
Drag increases with speed (1) until it equals weight, so resultant force is zero (1).
2. Find the pressure 5.0 m under water (ρ = 1000 kg m⁻³). (1 mark)
Show the mark scheme answer
4.9 x 10⁴ Pa.
3. Define a couple. (1 mark)
Show the mark scheme answer
A pair of equal and opposite forces whose lines of action do not coincide.
Forces in Action FAQs
What does this topic cover?
Forces, terminal velocity, moments and pressure.
Which practical links here?
Investigating terminal velocity.
What is upthrust?
The upward force equal to the weight of fluid displaced.
Revise this topic with flashcards: OCR A Level Physics A H556 Flashcards, with mark scheme answers for Anki and Quizlet.
