# NCERT Solutions for Class 11 Physics Chapter 3 Motion In a Straight Line

NCERT Solutions for Class 11 Physics Chapter 3 Motion In a Straight Line: We can see speed measurement on a vehicle. A car showing 50 speed implies that the car can cover 50 Km in one hour. That is speed is defined as the distance traveled per unit time. In S.I units, we represent speed in ms-1. In NCERT solution for class 11 Physics chapter 3, we study the motion of an object without considering the cause of motion. The NCERT solutions for class 11 Physics chapter 3 Motion In a Straight Line gives an introduction to Mechanics and this chapter is the basis for a few other chapters of NCERT class 11 Physics.

The first topic of  NCERT solutions for class 11 Physics chapter 3 starts with the concept of position, path length and displacement. Consider an example of a man walking along a rectangular field of side length 12m and 5m as shown below.

The man walks from A to B then B to C. Then we say that the distance covered by the man is AB+BC=12+5=17m. The displacement is AC

$AC=\sqrt{(AB)^2+(BC)^2}=\sqrt{12^2+5^2}=13m$

Thus the displacement is less than the distance and =13m. Now consider the man moving from A to B to C to D to A. Then the distance= perimeter of the field=2(12+5)=34m, whereas displacement = 0m since the initial and final position is same.

Suppose in the above case the man travels the distance of 34 m in 8.5 sec then the speed of the man = 4ms-1 and velocity=0 ms-1 why?.

Can you find an example for a case where displacement and velocity are negative? Is negative speed and distance is possible? Such questions are answered in the NCERT Solutions for Class 11 Physics Chapter 3 Motion In a Straight Line.

## The main topics of NCERT solution for class 11 Physics chapter 3 are given below:

3.1 Introduction

3.2 Position, Path Length, And Displacement

3.3 Average Velocity And Average Speed

3.4 Instantaneous Velocity And Speed

3.5 Acceleration

3.6 Kinematic Equations For Uniformly Accelerated Motion

3.7 Relative Velocity

Another very important topics of NCERT Solutions for Class 11 Physics Chapter 3 Motion In a Straight Line is the relative velocity. For example, when we travel in a vehicle we feel the trees are moving. This is due to the relative velocity. There are many other interesting examples of relative velocity in our daily life. Try to find a few examples.

Following equations of uniformly accelerated motion are used to solve most of the problems of the  NCERT Solutions for Class 11 Physics Chapter 3.

$\\v=u+at\\s=ut+\frac{1}{2}at^2\\v^2-u^2=2as$

where u is the initial velocity, v is the final velocity, a is the acceleration, s is the displacement and t is the time

The following are the  NCERT Solutions for Class 11 Physics Chapter 3 Motion In a Straight Line

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## NCERT Solutions for class 11 Physics

 Chapter-1 Physical world Chapter-2 Chapter-3 Chapter-4 Chapter-5 Chapter-6 Chapter-7 Chapter-8 Chapter-9 Chapter-10 Mechanical Properties of Fluids Chapter-11 Chapter-12 Chapter-13 Kinetic Theory Chapter-14 Chapter-15

## NCERT Solutions for Class 11- Subject wise

 NCERT solutions for Class 11 Biology NCERT solutions for Class 11 Maths NCERT solutions for Class 11 Chemistry NCERT solutions for Class 11 Physics