1.3 Forces, Newton's Laws and Falling
Interaction pairs, resultant force, inertia, F = ma, weight, mass, free fall, drag and terminal velocity.
How to study for CCEA GCSE Physics
Link every equation to a physical model and unit, interpret graphs and evidence, and prepare each prescribed practical from method through evaluation.
Core concepts
Concept 1
Interaction forces occur as equal and opposite pairs on different objects, while a resultant combines forces on one object.
Exam cue: Confirm the CCEA unit, tier and whether the task tests a model, calculation, explanation or practical judgement.
Concept 2
A non-zero resultant force produces acceleration according to F = ma; zero resultant means constant velocity or rest.
Exam cue: Draw forces on the named object only, choose a positive direction and connect the resultant force to the change in motion.
Concept 3
During a fall, increasing drag can balance weight so the resultant becomes zero and terminal velocity is reached.
Exam cue: Show substitutions and units, connect evidence to the physical model and limit the conclusion to the stated conditions.
Risk pitfalls and guardrails
Cancelling a Newton's third-law pair even though the two forces act on different objects.
Guardrail: Do not import an England board, Single Award or Double Award structure, and do not replace a causal physical explanation with an equation alone.
Importing an equation sheet, Higher-only boundary or paper convention from an England 9-1 board.
Guardrail: Use the current CCEA formatting to confirm Higher-only content and the correct paper duration; do not infer tier scope from another exam board.
Giving a calculator display or named law without the working, units, causal explanation or evidence the command word requires.
Guardrail: Do not import an England board, Single Award or Double Award structure, and do not replace a causal physical explanation with an equation alone.
Memory anchors
Resultant force
The single force with the same effect as all forces acting on one object.
Inertia
The tendency of an object to resist a change in its motion.
Newton's second law
Resultant force equals mass multiplied by acceleration.
Weight
The gravitational force on a mass.
Drag
A resistive force opposing motion through a fluid.
Terminal velocity
Constant falling velocity reached when drag balances weight.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
A 4.0 kg trolley accelerates at 2.5 m/s². What resultant force acts on it?
A box is pulled right by 18 N and left by 11 N. What is the resultant force?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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