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The NCERT Solutions for Class 11 Physics Chapter 4 Motion in a plane are provided in the article below. The motion of a body can be referred to as its change in position depending on its surroundings in a given time interval. The motion of any object which has some mass can be measured in distance, displacement, speed and velocity, acceleration, and time.
Class 11 Physics Chapter 4 Motion in a Plane belongs to Unit 2 Kinematics which has a weightage of 23 marks along with Unit 1 Physical World and Measurement and Unit 3 Laws of Motion. NCERT Solutions for Chapter 4 Physics Class 11 deals with the concept of scalars and vectors, uniform circular motion, and relative velocity in two dimensions.
Download PDF: NCERT Solutions for Class 11 Physics Chapter 4
NCERT Solutions for Class 11 Physics Chapter 4
Class 11 Physics Chapter 4 – Concepts Covered
- Motion in a plane is known as motion in two dimensions. For example, projectile motion, circular motion etc.
- Scalar Quantities are the physical quantities that are specified by their magnitude or size alone.
| Examples of Scalar Quantities – Length, mass, density, speed, work, etc |
- Vector Quantities are the physical quantities that are characterised by both magnitude and direction.
| Example of Vector Quantities – Velocity, displacement, acceleration, force, momentum, torque etc. |
- A unit vector is a vector with a unit magnitude that points in a particular direction. It is used to only specify the direction.
| It can be represented as \(\widehat{A} = { \overrightarrow{A} \over |\overrightarrow{A}|}\) |
- Parallelogram Law of Vector Addition: If \(\overrightarrow{A}\)and \(\overrightarrow{B}\) are the two adjacent sides of a parallelogram, inclined at an angle \(\theta\), then the magnitude of resultant vector is determined.
| \(R = \sqrt{A^2 + B^2 +2ABcos\theta}\) |
- The projectile is an initial inclined velocity which subsequently follows a path determined by the gravitational force that acts on it and by the frictional resistance of the air.
- The path followed by a projectile is known as its trajectory.
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