This document discusses different types of motion including: - Motion is defined as a change in an object's position over time. - Position is relative to an origin point and can be positive or negative. - Types of motion include rectilinear, circular, and periodic motion. - Velocity refers to an object's speed and direction of motion.

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2. Motion
 Motion is some kind of a change in the position of an
object with time.
Fling Bird Moving train Fling plane
 You might have noticed that the bird is not at the same place
after some time, while the table is at the same place.
 On this basis you may have decided whether an object is at rest
or in motion.

3. The position variable
 Motion is about knowing where things are and how
they move.
 To understand where things are, we need to
understand position.
 Position is a variable and it is always relative to an
origin, or the place where the object’s starting point
was zero.

4. Forward and backward
 Position and distance are similar but not
the same. Both use units of length.
 Distance can have only positive values.
 Position uses positive and negative
numbers.
 Positive numbers are for positions to the right (in front) of
the origin.
 Negative numbers are for positions to the left (or behind) the
origin.

5. Forward and backward
 Many variables can be positive or negative.
 These include position, speed, and force.
 These variables are called vectors because they can
have a value and a direction.
We use the term
velocity to mean
speed with direction.

6. Types of Motion
 Rectilinear motion:
 The objects move along a straight line is called the
rectilinear motion.
 Example: motion of a vehicle on a straight road,
march-past of soldiers in a parade.

7.  Circular motion is a movement of an object along
the circumference of a circle or rotation along a circular
path or a circular orbit.
 Example : The motion of a point marked on the blade of
an electric fan or the hands of a clock are examples of
circular motion.
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8.  Periodic motion:
 An object repeats its motion after some time.
 Motion of a pendulum, a branch of a tree moving to and
fro, motion of a child on a swing, strings of a guitar or
the surface of drums being played, are all examples of
periodic motion

9. Velocity
 The change in position is the velocity multiplied by the
time.

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