13. Motion and time by Dilip Kumar Chandra

by Dilip Kumar Chandra PGT Biotechnology JNV Raipur CG

1. 1

2. MOTION
Motion is a some kind of change in
the position of the object

3. SPEED
Distance covered by an object in a
unit time is called speed of the
object.
Ex. If a car is moving with a speed of
50 K.M /h it implies that it will cover
a distance of 50 K.M.in one hour.
Speed =Total distance covered
----------------------------
total time taken

4. MOTION-NON UNIFORM MOTION
If the speed of the object moving
along a straight line keeps changing
,its motion is said to be non uniform
motion.

5. MOTION-UNIFORM MOTION
If the speed of the object moving
along a straight line with a constant
speed, its motion is said to be
uniform motion.

6. Measurement of time
We measure the intervals of time .
Ex.
1.The time interval between one sun
raise and the next was called day.
2. A year was fixed as the time taken by
the earth to complete one rotation.

7. Measurement of time
Periodic events are used for the
measurement of time
Periodic motion of the pendulum has
been used to make clocks and
watches.
Well known periodic motion is that of
simple pendulum.

8. SIMPLE PENDULUM
The pendulum completes one oscillation when bob
moves one extreme position `A’ to the other extreme
potion `B’ and come back to `A’.
The time taken by the pendulum to complete one
oscillation is called time period.
The time taken by the pendulum to complete one
oscillation is called time period.
If the time period is one second it is called seconds
pendulum. pendulum clocks are developed on this
principle

9. SIMPLE PENDULUM

10. SIMPLE PENDULUM
The time taken by
the pendulum to
complete one
oscillation is called
time period.
If the time period
is one second it is
called seconds
pendulum.
pendulum clocks
are developed on
this principle

11. Quartz watches
Now a days most of the clocks or
watches have an electric circuit with
one or more cells. These clocks are
called quartz watches.

12. UNITS OF TIME AND SPEED
BASIC UNIT OF TIME IS –SECOND
BASIC UNIT OF SPEED
=DISTANCE/TIME. m/S.

13. MEASUREMENT OF SPEED
Speed is measured with the help of
speedometer.It records the speed
directly in km/h.

14. MEASUREMENT OF DISTANCE
Another meter which measures the
distance moved by the vehicle . This
is known as ODOMETER

15. DISTANCE AND TIME GRAPH
Motion of the objects can be
presented in pictorial form by their
distance and time graph

16. DISTANCE AND TIME GRAPH
The distance and time graph for the
motion of an object moving with
constant speed is straight line.

17. DISTANCE AND TIME GRAPH
With the help of distance and time
graph we can find the speed of the
bus at a particular time or the
distance traveled by the vehicle at a
particular time.