Forces: Newton and three laws

📖 Lesson ──▶ 🎯 Quiz — pick the translation ──▶ ✅ Lesson done

Newton described motion in three rules. 1) A body at rest stays at rest until a force pushes (inertia — that is why braking throws you forward). 2) F = m×a: force equals mass times acceleration — heavy things are harder to speed up. 3) Action = reaction: the rocket pushes gas down — the gas pushes the rocket up.

●Mass (kg) ≠ weight (N): less weight on the Moon, same mass
●Friction: helps walking, slows machines
●Aerodynamics: shape decides, the sports car "cuts" air

🚗 The seatbelt is inertia\u2019s direct consequence: on impact the body keeps flying at vehicle speed. Always buckle up.

🎯

Test yourself!

Practice the topic with the trainer — like after class

Quiz — pick the translation → 🖨 Worksheet

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