Laws of Motion — Chapter Summary
CBSE · Class 11 · Physics
Summary of Laws of Motion for CBSE Class 11 Physics. Key concepts: The idea that an external, A body remains at rest and Momentum is defined by p =.
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Overview
Motion becomes fully understandable only when the causes of motion are studied. The chapter develops the idea that force, momentum, inertia, friction, action and reaction, conservation of momentum, equilibrium, and circular motion are linked by Newton’s laws. It begins by rejecting the flawed Aristo
Key Concepts
The idea that an external force
The idea that an external force is needed to keep a body in motion is incorrect. In practice, a moving body slows down because friction or other resis
A body remains at rest
A body remains at rest or in uniform straight-line motion unless acted upon by an external force. In simple form, if the net external force is zero, a
Momentum is defined by p =
Momentum is defined by p = mv and is a vector quantity. It depends on both mass and velocity, so heavier or faster bodies have greater momentum.
The rate of change of momentum
The rate of change of momentum is proportional to the applied force and acts in the direction of the force. In SI units, F = dp/dt = ma. The law is ve
Impulse = force × time duration
Impulse = force × time duration = change in momentum. It is important when a large force acts for a very short time, such as in a catch or collision.
Learning Objectives
- Understand why Aristotelian ideas of motion are incorrect and how Galileo corrected them.
- State and apply Newton’s first, second, and third laws of motion.
- Use momentum p = mv and relate force to the rate of change of momentum.
- Understand impulse as force multiplied by time and equal to change in momentum.
- Apply conservation of momentum to isolated systems and collisions.
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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