Notes : Newtons Laws of Motion Class 9 Notes | EduRev

Class 9 : Notes : Newtons Laws of Motion Class 9 Notes | EduRev

 Page 1


Newton’s  
Laws of 
Motion 
I. Law of Inertia 
II. F=ma 
III. Action-Reaction 
Page 2


Newton’s  
Laws of 
Motion 
I. Law of Inertia 
II. F=ma 
III. Action-Reaction 
  While most people know 
what Newton's laws say, 
many people do not know 
what they mean (or simply do 
not believe what they mean).  
Page 3


Newton’s  
Laws of 
Motion 
I. Law of Inertia 
II. F=ma 
III. Action-Reaction 
  While most people know 
what Newton's laws say, 
many people do not know 
what they mean (or simply do 
not believe what they mean).  
Newton’s Laws of Motion 
? 1
st
 Law – An object at rest will stay at 
rest, and an object in motion will stay in 
motion at constant velocity, unless acted 
upon by an unbalanced force. 
? 2
nd
 Law – Force equals mass times 
acceleration. 
? 3
rd
 Law – For every action there is an 
equal and opposite reaction. 
Page 4


Newton’s  
Laws of 
Motion 
I. Law of Inertia 
II. F=ma 
III. Action-Reaction 
  While most people know 
what Newton's laws say, 
many people do not know 
what they mean (or simply do 
not believe what they mean).  
Newton’s Laws of Motion 
? 1
st
 Law – An object at rest will stay at 
rest, and an object in motion will stay in 
motion at constant velocity, unless acted 
upon by an unbalanced force. 
? 2
nd
 Law – Force equals mass times 
acceleration. 
? 3
rd
 Law – For every action there is an 
equal and opposite reaction. 
1
st
 Law of Motion 
 (Law of Inertia) 
 
 An object at rest will stay at 
rest, and an object in motion 
will stay in motion at 
constant velocity, unless acted 
upon by an unbalanced force. 
Page 5


Newton’s  
Laws of 
Motion 
I. Law of Inertia 
II. F=ma 
III. Action-Reaction 
  While most people know 
what Newton's laws say, 
many people do not know 
what they mean (or simply do 
not believe what they mean).  
Newton’s Laws of Motion 
? 1
st
 Law – An object at rest will stay at 
rest, and an object in motion will stay in 
motion at constant velocity, unless acted 
upon by an unbalanced force. 
? 2
nd
 Law – Force equals mass times 
acceleration. 
? 3
rd
 Law – For every action there is an 
equal and opposite reaction. 
1
st
 Law of Motion 
 (Law of Inertia) 
 
 An object at rest will stay at 
rest, and an object in motion 
will stay in motion at 
constant velocity, unless acted 
upon by an unbalanced force. 
1
st
 Law 
? Inertia is the  
tendency of an 
object to resist 
changes in its 
velocity: 
whether in 
motion or 
motionless. 
These pumpkins will not move unless acted on 
by an unbalanced force. 
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