📘 Chapter: Motion in a Straight Line
(Class 11 Physics – Kinematics Part 1 | NEET/Board)
🌟 1. Introduction
Kinematics is the branch of Physics that deals with the description of motion of objects
without considering the forces causing the motion.
When an object moves along a straight line, it is said to be in rectilinear or one-dimensional
motion.pp
🔸 2. Basic Terms
✅ Distance
Total path length covered by a body
Scalar quantity
Always positive
Unit: meter (m)
✅ Displacement
Shortest distance from initial to final position
Vector quantity (has direction)
Can be positive, negative, or zero
Unit: meter (m)
📝 Example:
If a person walks 10 m east, then 10 m west,
, → Distance = 20 m
→ Displacement = 0 m
🔸 3. Speed & Velocity
✅ Speed
Distance covered per unit time
Scalar
Unit: m/s
✅ Velocity
Displacement per unit time
Vector
🧠 Note:
If object returns to start point → Displacement = 0 → Velocity = 0
But speed ≠ 0
🔸 4. Types of Motion
Type. Description
Uniform motion= Equal distances in equal intervals
Non-uniform motion= Unequal distances in equal intervals
(Class 11 Physics – Kinematics Part 1 | NEET/Board)
🌟 1. Introduction
Kinematics is the branch of Physics that deals with the description of motion of objects
without considering the forces causing the motion.
When an object moves along a straight line, it is said to be in rectilinear or one-dimensional
motion.pp
🔸 2. Basic Terms
✅ Distance
Total path length covered by a body
Scalar quantity
Always positive
Unit: meter (m)
✅ Displacement
Shortest distance from initial to final position
Vector quantity (has direction)
Can be positive, negative, or zero
Unit: meter (m)
📝 Example:
If a person walks 10 m east, then 10 m west,
, → Distance = 20 m
→ Displacement = 0 m
🔸 3. Speed & Velocity
✅ Speed
Distance covered per unit time
Scalar
Unit: m/s
✅ Velocity
Displacement per unit time
Vector
🧠 Note:
If object returns to start point → Displacement = 0 → Velocity = 0
But speed ≠ 0
🔸 4. Types of Motion
Type. Description
Uniform motion= Equal distances in equal intervals
Non-uniform motion= Unequal distances in equal intervals
