PPT - Motion and Time Class 7 Notes | EduRev

Science Class 7

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 
Thread 
Bob 
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