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1. MOTION IN ONE DIMENSION
SUBMITTED BY :AMAN DHALIWAL
CLASS:9TH
ROLL NO:1
SUBMITTED TO:MR AMAN

2. SCALAR AND VECTOR QUANTITIES
SCALARS:These are physical quantities which are expressed only by their magnitude.
For example:mass,length,time,distance etc.
VECTORS:These physical quantities require the magnitude as well as the directionto express them,
then only their meaning is complete.
For example:displacement,velocity,acceleration etc.
This Photo by Unknown Author is licensed under CC BY-SA

3. ONE DIMENSIONAL MOTION
When a body moves along a straight line path,its motion is said to be one dimensional motion.
• REPRESENTATION OF ONE DIMENSIONAL MOTION
The path of one dimensional motion can be represented by straight line parallel to x-axis if x-axis
is taken in the direction of motion . Each point on the straight line represents the position of
particle at different instants.
This Photo by Unknown Author is licensed under CC BY

4. DISTANCE AND DISPLACEMENT
• DISTANCE : The total length of path along which a body moves, is called the distance travelled by
it . The distance travelled by a body depends on the path followed by body.
• DISPLACEMENT: The shortest distance from the initial to the final position of the body, is the
magnitude of displacement and its direction is from the initial position to the final position.

5. SPEED AND VELOCITY
• SPEED: The speed of a body is the rate of change of distance with
time. Numerically, it is the distance travelled by the body in 1s.
• VELOCITY: The velocity of a body is the travelled per second by the
body in a specified direction.

6. ACCELERATION AND RETERADATION
• ACCELERATION : Acceleration is the rate of change in velocity with
time.
• RETERADATION: While if the velocity of body decreases with time,
the motion is said to be decelerated.