First law — balanced forces
If forces are balanced, velocity stays constant. A book on a table stays still because gravity and the normal force cancel out.
Second law — F = ma
Acceleration depends on force and mass. Always state units: N, kg, m/s².
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Quick answers
How do I explain Newton's second law in GCSE Physics?
State F = ma, define each variable with units (N, kg, m/s²), and give a real example such as a accelerating car.
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