2. CONTENT OF MY
PRESENTATION
• What is a motion
• What is speed
• What is magnitude
• What is the role of speed in motion
• Some of the formulas of speed
• Use of Speed with direction
• What is the SI unit of speed
• What is a velocity
• What’s the rate of change of velocity
• What is direction
• What is magnitude of velocity
• What is the role of velocity in motion
• How can we measure velocity
• What is the SI unit of velocity
• How to find velocity
• What is velocity time graph
• My small conclusion before you
• Thank you all
3. WHAT IS MOTION
• Motion is the process of an object changing its position
relative to its surroundings over time. It can also refer to
an active or functioning state. Explanation: Motion can
be uniform, meaning speed remains constant, or non-
uniform, where speed changes. Motion can be
described by its speed and direction. An object at rest
will remain at rest unless acted upon by an external
force. Motion can be translational, rotational, or
oscillatory.
4. WHAT IS SPEED
• The rate of change of position of an object
in any direction. Speed is measured as the
ratio of distance to the time in which the
distance was covered. Speed is a scalar
quantity as it has only direction and no
magnitude.
5. HOW TO MEASURE
SPEED
• Speed can be measured using various
instruments, each designed for specific
applications. These include speedometers,
tachometers, anemometers, and more.
Speedometers measure the speed of
vehicles, tachometers measure rotational
speed, and anemometers measure wind
speed.
6. WHAT IS MAGNITUDE
• Magnitude is defined as “how much of a quantity”.
For instance, the magnitude can be used for explaining
the comparison between the speeds of a car and a
bicycle. It can also be used to explain the distance
travelled by an object or to explain the amount of an
object in terms of its magnitude.
7. WHAT IS A ROLE OF
SPEED IN MOTION
• Speed plays a crucial role in motion by quantifying
how rapidly an object changes its position over time.
It’s a fundamental concept in physics and is used to
describe the rate of movement, whether it’s a car
driving, a person walking, or a ball being thrown.
Speed doesn’t specify direction; that’s where the
concept of velocity comes in.
8. SOME OF THE
FORMULAS OF SPEED
• The formula for speed is distance divided by
time. Let the distance be 5m and the time
taken is 6s so the speed is 5/6 meter per
second
• The concept of speed as “distance per unit
of time” is generally credited to Galileo
Galilei. He is considered the first to formally
define and measure speed by considering
the relationship between the distance
traveled and the time taken.
9. WHAT IS SPEED
TIME GRAPH
• speed-time graph, also known as a velocity-
time graph, visually represents how the
speed of an object changes over time. It
plots speed (usually in m/s or km/h) on the
vertical axis against time on the horizontal
axis. The shape of the graph reveals
information about the object’s motion, such
as acceleration, deceleration, and the
distance traveled.
10. USE OF SPEED WITH
DIRECTION
• Speed with a specific direction is called velocity. It’s a
vector quantity, meaning it has both magnitude (speed)
and direction. Understanding velocity is crucial in
various fields like physics, navigation, and even
everyday situations because it tells you not only how
fast something is moving but also in which direction.
11. SI UNIT OF SPEED
• The SI (International System of Units) unit for speed
is meters per second (m/s). It represents the distance
traveled in meters in one second.
12. WHAT IS VELOCITY
Velocity is the rate of change of
displacement.
It is a scalar quantity It has both magnitude as well
as direction
13. WHAT IS THE RATE OF
CHANGE OF VELOCITY
• The rate of change of velocity is called
acceleration. It describes how quickly an
object’s velocity (including both speed and
direction) changes over time. An example of
this is a car accelerating from 0 to 60 mph,
where the change in velocity (from 0 to 60
mph) divided by the time it takes to achieve
that change is the car’s acceleration.
14. WHAT IS
DIRECTION Direction in physics describes the way an
object moves or is facing, like north, south,
east, west, up, down, or left, right. It’s
essentially the course or path an object takes.
Direction is often represented by an arrow
showing the movement from one point to
another.
For example a car moves 5 km East and 1
km north so the East and North are
directions
15. WHAT IS
MAGNITUDE
OF VELOCITY
• The magnitude of velocity is also known as speed. It
represents how fast an object is moving, without
considering its direction. In other words, speed is the rate at
which an object covers distance.
16. WHAT IS THE ROLE OF
VELOCITY IN MOTION
• Velocity plays a crucial role in motion by describing
both how fast an object is moving (its speed) and in
what direction it’s moving. This vector quantity
provides a comprehensive understanding of an object’s
motion, enabling predictions of its future position.
17. HOW CAN WE MEASURE
VELOCITY
• Velocity, the rate of change of an object’s position, can
be measured by determining its displacement (change
in position) over a specific time interval. This is
typically done by measuring the distance traveled in a
given direction and the time it takes to travel that
distance. Various instruments and methods are used
depending on the context, including flowmeters, pitot
tubes, and laser Doppler anemometers etc.
18. WHAT IS THE SI UNIT OF
VELOCITY
• The SI (International System of Units) unit of velocity
is meters per second (m/s), which is also sometimes
written as m s ¹. Velocity is defined as the rate of
⁻
change of an object’s position over time.
19. HOW TO FIND VELOCITY
• To calculate velocity, you need the object’s
displacement and the time it took to travel that
displacement. Velocity is calculated by dividing the
displacement by the time interval.
20. WHAT IS VELOCITY
TIME GRAPH
• Velocity-time graphs with constant velocity
(zero …A velocity-time graph visually
represents how the velocity of an object
changes over time. It plots velocity (typically
on the y-axis) against time (on the x-axis).
The shape of the line on the graph reveals
information about an object’s acceleration
and displacement.
21. MY SMALL CONCLUSION
BEFORE YOU ALL
• In conclusion, speed and velocity, while related, are
distinct concepts in physics. Speed is the rate at which
an object moves, regardless of direction, while velocity
encompasses both the speed and direction of an
object’s motion. Understanding this difference is crucial
for accurately analyzing and describing motion.
22. THANK YOU
MA’AM AND MY
DEAR FRIENDS
FOR YOU ALL
HERE IS MY
UNWAVERING
SUPPORT
BEFORE YOU
ALL
Name
shobhita
Bhatt
01
Class 9th d
02
Roll
number 11
03
