WJEC A Level Physics
WJEC A Level Physics 1.3 Dynamics Exam Questions
Free WJEC A Level Physics exam questions on 1.3 Dynamics, with mark schemes. Covers Newton's laws, momentum, impulse and collisions.
1.3 Dynamics 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.
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A Level Physics Flashcards
Every answer is written in mark scheme wording, so you learn exactly what examiners give marks for. Pick your exam board, then test yourself with the questions on this page.
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About WJEC A Level Physics 1.3 Dynamics
This topic explains why objects move as they do.
What you need to know
- Newton's laws Inertia, F = ma (and F = Δp/Δt), and equal and opposite forces on different bodies.
- Momentum p = mv, conserved in a closed system.
- Collisions Elastic collisions conserve kinetic energy; inelastic do not.
- Free-body diagrams Identifying all forces on one body.
Common mistakes in 1.3 Dynamics
- Putting Newton's third law pairs on the same body.
- Forgetting momentum is a vector.
- Assuming all collisions conserve kinetic energy.
Try three 1.3 Dynamics exam-style questions
1. A 2.0 kg trolley at 3.0 m s⁻¹ hits and sticks to a stationary 1.0 kg trolley. Find their speed. (2 marks)
Show the mark scheme answer
Momentum 6.0 kg m s⁻¹ (1); v = 6.0/3.0 = 2.0 m s⁻¹ (1).
2. State Newton's second law in terms of momentum. (1 mark)
Show the mark scheme answer
Resultant force equals the rate of change of momentum.
3. Define impulse. (1 mark)
Show the mark scheme answer
Force x time, equal to the change in momentum.
1.3 Dynamics FAQs
What does Dynamics cover?
Newton's laws, momentum and collisions.
How do I show a collision is elastic?
Show total kinetic energy before equals total after.
Why do airbags help?
They increase collision time, reducing force for the same change in momentum.
Revise this topic with flashcards: A Level Physics Flashcards, with mark scheme answers for Anki and Quizlet.
