Class 11 Physics - MP
Laws of Motion
The chapter Laws of Motion in Class 11 Physics builds upon kinematics by exploring the causes of motion. For MPBSE students, this is a foundational chapter that introduces Newton's three laws of motion, the principle of conservation of linear momentum, and the concepts of inertia and friction. Understanding these laws is essential for solving numerical problems related to forces, connected bodies, and inclined planes. This chapter carries significant weight in the annual board examinations, making a strong grasp of both theoretical definitions and numerical problem-solving crucial for scoring high marks.
Start Learning FreeKey Concepts
Inertia
It is the inherent property of a body by virtue of which it opposes any change in its state of rest or uniform motion.
Newton's First Law of Motion
Every body continues in its state of rest or of uniform motion in a straight line unless compelled by an external force to change that state.
Newton's Second Law of Motion
The rate of change of linear momentum of a body is directly proportional to the applied external force and takes place in the direction in which the force acts.
Newton's Third Law of Motion
To every action, there is always an equal and opposite reaction acting on two different bodies.
Conservation of Linear Momentum
The total linear momentum of an isolated system of interacting bodies remains conserved if no external force acts on it.
Friction
The opposing force that comes into play when one body moves or tends to move over the surface of another body.
Important Formulas
Board Exam Info
In the Madhya Pradesh (MPBSE) Class 11 Physics board examination, this chapter typically carries around 6 to 8 marks. Questions usually include 1-mark objective questions, 2-mark or 3-mark short answer questions based on laws and definitions, and a 4-mark numerical problem involving pulley systems, connected bodies, or friction on an inclined plane.
Frequently Asked Questions
Why do we say Newton's first law is the same as the definition of force?
Newton's first law defines force as an external agency that changes or tends to change the state of rest or uniform motion of a body.
Are action and reaction forces able to cancel each other?
No, action and reaction forces do not cancel each other because they act on two different bodies, not on the same body.
Why is sliding friction slightly less than static friction?
Sliding friction is less than static friction because the surfaces in contact do not get enough time to lock properly into each other's irregularities during motion.
Learn Laws of Motion with Your AI Tutor
10 different ways to study this chapter. Free for 3 chapters per day.
Lecture
Key Points
Interactive
Quiz
Flashcards