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# PPT - Motion and Time Class 7 Notes | EduRev

## Class 7 : PPT - Motion and Time Class 7 Notes | EduRev

``` Page 1

CHAPTER - 13

MOTION AND TIME
Page 2

CHAPTER - 13

MOTION AND TIME
1) Motion :-
Motion :- is the change in position of an object with time.
There are different types of motions. They are :-
i) Motion along a straight line (Rectilinear motion) Eg :-
Motion of a car on a straight road.
ii) Periodic motion. Eg :- Motion of a pendulum.
iii) Circular motion. Eg :- Motion of the earth around the sun.

Motion along a straight line
Periodic motion Circular motion
Page 3

CHAPTER - 13

MOTION AND TIME
1) Motion :-
Motion :- is the change in position of an object with time.
There are different types of motions. They are :-
i) Motion along a straight line (Rectilinear motion) Eg :-
Motion of a car on a straight road.
ii) Periodic motion. Eg :- Motion of a pendulum.
iii) Circular motion. Eg :- Motion of the earth around the sun.

Motion along a straight line
Periodic motion Circular motion
2) Speed :-
Speed :- The distance covered by an object in a unit time
is called the speed of the object.
Eg :- If a car covers a distance of 100 kilometres in one
hour and a bus covers a distance of 50 kilometres in one
hour, then the speed of the car is more than the speed of
the bus.
Since the speed of most objects are not constant, the
speed is the average speed.
Total distance covered
Speed =  --------------------------------
Time taken
Uniform motion :- If the speed of an object is constant, it is
in uniform motion.
Non uniform motion :- If the speed of an object keeps
changing, it is in non uniform motion.
Page 4

CHAPTER - 13

MOTION AND TIME
1) Motion :-
Motion :- is the change in position of an object with time.
There are different types of motions. They are :-
i) Motion along a straight line (Rectilinear motion) Eg :-
Motion of a car on a straight road.
ii) Periodic motion. Eg :- Motion of a pendulum.
iii) Circular motion. Eg :- Motion of the earth around the sun.

Motion along a straight line
Periodic motion Circular motion
2) Speed :-
Speed :- The distance covered by an object in a unit time
is called the speed of the object.
Eg :- If a car covers a distance of 100 kilometres in one
hour and a bus covers a distance of 50 kilometres in one
hour, then the speed of the car is more than the speed of
the bus.
Since the speed of most objects are not constant, the
speed is the average speed.
Total distance covered
Speed =  --------------------------------
Time taken
Uniform motion :- If the speed of an object is constant, it is
in uniform motion.
Non uniform motion :- If the speed of an object keeps
changing, it is in non uniform motion.
3) Measurement of time :-
Time is measured by using clocks or watches. Clocks
and watches make use of periodic motion.
Wall clocks
Table clock
Watches
Digital clocks
Page 5

CHAPTER - 13

MOTION AND TIME
1) Motion :-
Motion :- is the change in position of an object with time.
There are different types of motions. They are :-
i) Motion along a straight line (Rectilinear motion) Eg :-
Motion of a car on a straight road.
ii) Periodic motion. Eg :- Motion of a pendulum.
iii) Circular motion. Eg :- Motion of the earth around the sun.

Motion along a straight line
Periodic motion Circular motion
2) Speed :-
Speed :- The distance covered by an object in a unit time
is called the speed of the object.
Eg :- If a car covers a distance of 100 kilometres in one
hour and a bus covers a distance of 50 kilometres in one
hour, then the speed of the car is more than the speed of
the bus.
Since the speed of most objects are not constant, the
speed is the average speed.
Total distance covered
Speed =  --------------------------------
Time taken
Uniform motion :- If the speed of an object is constant, it is
in uniform motion.
Non uniform motion :- If the speed of an object keeps
changing, it is in non uniform motion.
3) Measurement of time :-
Time is measured by using clocks or watches. Clocks
and watches make use of periodic motion.
Wall clocks
Table clock
Watches
Digital clocks
4) Simple pendulum :-
A simple pendulum has a small metallic bob suspended
from a stand by a thread.
If the bob is taken to one side and released, it moves to
and fro. The to and fro motion of the simple pendulum is
called periodic motion or oscillatory motion.
A
O
B
A simple pendulum
Bob
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