MOTION
Class - 9
MOTION
A body is said to be in motion if it changes its position with time, relative to a
reference point.
Types of Motion:
Translation Motion: Motion along a straight line or curve.
RECTILINEAR MOTION: Straight path (e.g., car on a straight road)
CURVILINEAR MOTION: Curved path (e.g., ball thrown)
Rotational Motion: Object rotates about an axis (e.g., fan blades)
Oscillatory Motion: To and fro motion (e.g., pendulum)
Distance and Displacement
Distance: Total path covered by an object.
o Scalar quantity
o Always positive
Displacement: Shortest distance between initial and final position.
o Vector quantity
o Can be zero or negative
Example:
If a person walks 4 m east and 3 m west,
Distance = 4 + 3 = 7 m
Displacement = 4 - 3 = 1 m east
Class - 9
MOTION
A body is said to be in motion if it changes its position with time, relative to a
reference point.
Types of Motion:
Translation Motion: Motion along a straight line or curve.
RECTILINEAR MOTION: Straight path (e.g., car on a straight road)
CURVILINEAR MOTION: Curved path (e.g., ball thrown)
Rotational Motion: Object rotates about an axis (e.g., fan blades)
Oscillatory Motion: To and fro motion (e.g., pendulum)
Distance and Displacement
Distance: Total path covered by an object.
o Scalar quantity
o Always positive
Displacement: Shortest distance between initial and final position.
o Vector quantity
o Can be zero or negative
Example:
If a person walks 4 m east and 3 m west,
Distance = 4 + 3 = 7 m
Displacement = 4 - 3 = 1 m east
