ForcesTopic Summary
Topic Summary: Newton's Laws of Motion
Part of Newton's Laws of Motion — GCSE Physics
This topic summary covers Topic Summary: Newton's Laws of Motion within Newton's Laws of Motion for GCSE Physics. Revise Newton's Laws of Motion in Forces for GCSE Physics with 13 exam-style questions and 15 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 15 of 15 in this topic. Use this topic summary to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 15 of 15
Practice
13 questions
Recall
15 flashcards
Topic Summary: Newton's Laws of Motion
Key Terms
- Inertia: Resistance to change in motion
- Resultant force: Net combined force
- Third Law pair: Equal, opposite forces on different objects
- Acceleration: Rate of change of velocity (m/s²)
The Three Laws
- 1st: No resultant force → constant velocity
- 2nd: Resultant force causes acceleration (F = ma)
- 3rd: Equal and opposite forces on different objects
Key Equations
- F = ma
- a = F ÷ m
- m = F ÷ a
- Units: F in N, m in kg, a in m/s²
Exam Tips
- F in F = ma is RESULTANT force
- Third Law pair: name both forces and both objects
- Weight ≠ normal force (not a Third Law pair)
- Constant speed = balanced forces (not zero forces)