ForcesTopic Summary
Topic Summary: Forces and Their Effects
Part of Forces & Their Effects — GCSE Physics
This topic summary covers Topic Summary: Forces and Their Effects within Forces & Their Effects for GCSE Physics. Revise Forces & Their Effects in Forces for GCSE Physics with 25 exam-style questions and 11 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 13 of 13 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 13 of 13
Practice
25 questions
Recall
11 flashcards
Topic Summary: Forces and Their Effects
Key Terms
- Force: Push or pull — vector, measured in N
- Mass: Amount of matter — scalar, kg, constant
- Weight: Gravitational force — vector, N, varies
- Resultant force: Net single equivalent force
- Contact force: Requires physical touch
- Non-contact force: Acts at a distance
Key Facts
- Contact: friction, tension, normal force, air resistance, upthrust
- Non-contact: gravity, magnetic, electrostatic
- Zero resultant = constant velocity (or stationary)
- Non-zero resultant = acceleration
- g = 10 N/kg on Earth, 1.6 N/kg on Moon
Key Equations
- W = mg (Weight = mass × g)
- Forces same direction: add magnitudes
- Forces opposite direction: subtract magnitudes
Exam Tips
- Weight always in Newtons, never kg
- Free body diagram: one object, all forces on it
- Balanced ≠ no forces — just zero resultant
- State contact/non-contact type in every answer