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Summary kinematics- motion in a straight line

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2026/2027 Written for academic year
Institution Junior / 11th Grade
Course Physics
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kinematics matics( motion in a straight line) class 11 physics chapter 2. Contents: distance, displacement, time , speed, velocity, average speed, average velocity, acceleration, retardation, equations of motion, and free fall. Each topic with diagrams and graphs. Numerical problems after each topic. Practice problems. detailed pdf.

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KINEMATICS — MOTION IN A STRAIGHT LINE
Class 11 Physics • Complete Detailed Notes

Concepts + diagrams + graphs + derivations + topicwise solved numericals + practice problems + answer
key




Class 11 Physics • Kinematics: Motion in a Straight Line • Page 1

, 1. Distance
Distance is the total length of the actual path travelled. It is a scalar quantity and is always non-negative.




Solved Numerical 1
Question: A student walks 250 m east and then 150 m east. Find distance.
Solution: Distance = 250+150 = 400 m.

Solved Numerical 2
Question: A particle travels 5 m east, 4 m west and 7 m east.
Solution: Distance = 5+4+7 = 16 m.

Solved Numerical 3
Question: A runner completes 3 laps of a 400 m track.
Solution: Distance = 3×400 = 1200 m.

Practice Problems
1. 20 m east and 8 m west: find distance.
2. A car travels 2.5 km, 1.5 km and 4 km: find distance.


2. Displacement
Displacement is the change in position: Δx=x₂−x₁. It is a vector and can be positive, negative or zero.




Solved Numerical 1
Question: A particle moves from x=2 m to x=10 m.
Solution: Δx=10−2=+8 m.

Solved Numerical 2
Question: A body moves 15 m east and 6 m west.
Solution: Taking east positive: Δx=15−6=9 m east.

Solved Numerical 3

Class 11 Physics • Kinematics: Motion in a Straight Line • Page 2

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