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
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
