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Yash Surve· 5 years ago
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What are Newtown law?

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Updated on09/19/26

Newton's three laws, published all the way back in 1687 in the Principia Mathematica, sound simple on the surface, but the nuance between them is where things actually get interesting.

The First Law: Inertia

An object will remain stationary or continue moving at constant velocity if the resultant force acting on it is zero.

  • An object with zero acceleration, whether it's sitting still or cruising at a steady speed, has a resultant force of 0 N acting on it. Flip that around: if the resultant force is zero, the object is either at rest or moving at a constant speed.

  • An object that's accelerating, speeding up, slowing down, or changing direction, must have a non-zero resultant force acting on it.

Example: Imagine a boat cruising at constant speed. Most people immediately draw the driving force pointing forward and stop there. But if the boat's moving at a constant speed, the resultant force has to be zero, which means something else, drag, resistance, must be pushing back with equal strength. That tension between "it's moving forward" and "the net force is zero" is where a lot of the real understanding lives.

The Second Law: Force, Mass and Acceleration

F = ma.

  • Force equals mass multiplied by acceleration, full stop.

  • A heavier object needs proportionally more force to reach the same acceleration as a lighter one.

This law is quietly doing more work than people give it credit for. It's the reason a dropped box accelerates as it falls, right up until the table's normal force meets its weight and brings the resultant force back to zero.

The Third Law: Action and Reaction

When two objects interact, they exert equal and opposite forces on each other.

  • Equal in size

  • Opposite in direction

  • Acting on different objects

  • The same type of force

Example: Take a box sitting on a table. The table pushes up on the box, and the box's weight pulls down. Those two forces feel like a "Third Law pair," but they're not, they're both acting on the same object, the box, so they're actually a First Law balance, not a Third Law pair. The real Third Law pair is the box pulling the Earth upward while the Earth pulls the box down, two different objects, same interaction.

Tara Verma
Tara Verma
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Tara Verma is a practising teacher and education content writer with over 10 years of classroom experience across primary and secondary levels. She holds a Master's degree in Education (M.Ed.) from Delhi University and a Bachelor of Education (B.Ed.) from Jamia Millia Islamia — qualifications that ground her writing in both pedagogical theory and the day-to-day realities of teaching in India. Her content covers exam preparation strategies, learning methodologies, curriculum guidance, student mental health, career counselling for students, and the evolving state of school and higher education in India. Her work has appeared on platforms including TeacherVision India, Jagran Josh, and Careers360, where she writes for students, parents, and fellow educators who need content built on actual teaching experience — not theory alone. Over a decade of working directly with students across age groups and learning levels has given Tara a practical understanding of how education content should be written — clearly, accessibly, and with genuine awareness of the challenges students and teachers face on the ground. She has taught 1,000+ students, contributed to school curriculum development initiatives, and published 250+ articles on education across digital platforms. She is an active member of the National Council of Teachers of English (NCTE) India. Across all her writing, every recommendation is classroom-tested, every insight comes from direct teaching experience, and every article is held to the same standard she applies in her own classroom — accuracy, clarity, and genuine usefulness for the reader.

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Replying to the question above
Answered on10/31/21

Newton's law of motion describes the relationship between the motion of an object and the force acting on it.

Isaac Newton stated the three law of motion -

First law of motion - It is also known as law of inertia. A body at rest will remain at rest and a body at motion will remain in motion unless it is acted upon by an external force.

Second law of motion - The force acting on an object is equal to the mass of that object times it's acceleration.

Third law of motion- For every action there is an equal and opposite reaction.

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