Class 11 Physics - ODISHA
Laws of Motion
The chapter Laws of Motion in Class 11 Physics under the Odisha BSE syllabus builds the foundation of classical mechanics by exploring why objects move and how forces affect their motion. Students will study Newton's three fundamental laws of motion, the principle of conservation of linear momentum, and the concepts of inertia and impulse. A significant portion is dedicated to understanding friction, including static and kinetic friction, along with the dynamics of circular motion. Mastering this chapter is crucial for scoring high in board exams, as it forms the basis for numerical problems and advanced physics topics in subsequent chapters.
Start Learning FreeKey Concepts
Newton's First Law of Motion
An object continues to remain at rest or in uniform motion in a straight line unless compelled by an external force to change its state. It defines the property of inertia.
Newton's Second Law of Motion
The rate of change of momentum of an object is directly proportional to the applied external force and takes place in the direction in which the force acts, given by the formula F = ma.
Newton's Third Law of Motion
To every action, there is always an equal and opposite reaction, meaning forces always occur in pairs acting on two different bodies.
Conservation of Linear Momentum
The total linear momentum of an isolated system of interacting particles remains conserved if no external force acts on the system.
Friction
The opposing force that comes into play when one body moves or tends to move over the surface of another body, classified into static, limiting, and kinetic friction.
Centripetal Force
The necessary force directed towards the center of a circular path that keeps a body moving in a circle with uniform speed.
Important Formulas
Board Exam Info
In the Odisha BSE Class 11 Physics examinations, this chapter typically carries around 6 to 8 marks. Questions usually include conceptual reasoning based on Newton's laws, derivation of the conservation of momentum, and numerical problems related to friction, inclined planes, and centripetal force.
Frequently Asked Questions
Why is Newton's first law called the law of inertia?
Because it defines inertia, which is the inherent property of a body to resist any change in its state of rest or uniform motion.
Are action and reaction forces able to cancel each other out?
No, because action and reaction forces act on two different bodies, not on the same body.
What is the main difference between static friction and kinetic friction?
Static friction acts when an object is at rest and prevents motion, whereas kinetic friction acts when the object is already sliding over a surface.
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