PPT - Matter in our Surroundings Class 9 Notes | EduRev

Science Class 9

Created by: Dr Manju Sen

Class 9 : PPT - Matter in our Surroundings Class 9 Notes | EduRev

 Page 1


CHAPTER -11 
 
FORCE  AND  PRESSURE 
Page 2


CHAPTER -11 
 
FORCE  AND  PRESSURE 
1) Force :-  
     Force is the push or pull on an object. 
    Eg:- If an object has to be moved, it has to be pushed or pulled. 
Page 3


CHAPTER -11 
 
FORCE  AND  PRESSURE 
1) Force :-  
     Force is the push or pull on an object. 
    Eg:- If an object has to be moved, it has to be pushed or pulled. 
2) Forces are due to interaction :- 
    An interaction of one object on another object results in a 
force between the two objects. 
    Eg :- If a man stands behind a car, the car does not move. 
If he pushes the car, he applies force and the car begins to 
move in the direction of the applied force. 
Page 4


CHAPTER -11 
 
FORCE  AND  PRESSURE 
1) Force :-  
     Force is the push or pull on an object. 
    Eg:- If an object has to be moved, it has to be pushed or pulled. 
2) Forces are due to interaction :- 
    An interaction of one object on another object results in a 
force between the two objects. 
    Eg :- If a man stands behind a car, the car does not move. 
If he pushes the car, he applies force and the car begins to 
move in the direction of the applied force. 
3) Exploring forces :- 
 a) If two forces act on a body in the same direction, the net force is  
     the sum of the two forces.  
                                                                                                                                                        
                                                                                   F
1 
                                                                                   F
2 
 
                                  Net force = F
1
 +  F
2 
b) If two forces act on a body in opposite directions, the net force is  
    the difference between the two forces. 
 
 
               F
1
                                                                F
2 
 
                                 Net force = F
2
 – F
1 
    The effect on the object depends on the net force acting on it. 
Page 5


CHAPTER -11 
 
FORCE  AND  PRESSURE 
1) Force :-  
     Force is the push or pull on an object. 
    Eg:- If an object has to be moved, it has to be pushed or pulled. 
2) Forces are due to interaction :- 
    An interaction of one object on another object results in a 
force between the two objects. 
    Eg :- If a man stands behind a car, the car does not move. 
If he pushes the car, he applies force and the car begins to 
move in the direction of the applied force. 
3) Exploring forces :- 
 a) If two forces act on a body in the same direction, the net force is  
     the sum of the two forces.  
                                                                                                                                                        
                                                                                   F
1 
                                                                                   F
2 
 
                                  Net force = F
1
 +  F
2 
b) If two forces act on a body in opposite directions, the net force is  
    the difference between the two forces. 
 
 
               F
1
                                                                F
2 
 
                                 Net force = F
2
 – F
1 
    The effect on the object depends on the net force acting on it. 
4) Effects of force on an object :- 
  i) Force can make an object to move from rest. 
 ii) Force can stop a moving object. 
iii) Force can change the speed of an object if it is  
     moving.  
iv) Force can change the direction of a motion of an  
     object. 
 v) Force can change the shape of an object. 
     Force may cause one or more of these effects. 
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