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'''Newton's laws of motion''' are a set of physical laws discovered by Sir Isaac Newton which describe the motion of objects.
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'''Newton's laws of motion''' are a set of physical laws discovered by Sir Isaac Newton [[http://en.wikipedia.org/wiki/Sir_Isaac_Newton]] which describe the motion of objects.
   
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==Laws of motion==
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:Newton's 1<sup>st</sup> law of motion
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:Newton's 2<sup>nd</sup> law of motion
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:Newton's 3<sup>rd</sup> law of motion
   
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==Description==
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'''Newton's 1<sup>st</sup> law of motion'''
  
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===Newton's 1<sup>st</sup> law of motion===
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Every object or body continues to be in its state of rest or of motion unless acted upon by an external unbalanced force.
   
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====Explained====
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''Every object or body continues to be in its state of rest or of motion unless acted upon by an external unbalanced force.''
  
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Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.
   
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This law describes the inertial nature of any object. It says that any object has inertia on account of its state of motion and that inertia remains unchanged until the object is acted upon by an external force.
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It can also be stated as
  
   
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For example, on a frictionless surface, a ball would continue to remain at rest until pushed and once in motion, it will continue moving in a straight line until a force causes it to stop or change direction.
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''Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.''
  
   
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===Newton's 2<sup>nd</sup> law of motion===
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This law describes the inertial nature of any object. It says that any object has inertia on account of its state of motion and that inertia remains unchanged until the object is acted upon by an external force. For example, on a frictionless surface, a ball would continue to remain at rest until pushed and once in motion, it will continue moving in a straight line until a force causes it to stop or change direction.
  
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The rate of change of momentum of a body is equal to the force applied to that body and in the direction of the force.
   
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====Explained====
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'''Newton's 2<sup>nd</sup> law of motion'''
  
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The acceleration of an object is directly proportional to the force applied to that object, in the direction of the force.
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''The rate of change of momentum of a body is equal to the force applied to that body and in the direction of the force.''
  
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Alternatively,
  
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''The acceleration of an object is directly proportional to the force applied to that object, in the direction of the force.''
  
   
 
This law is expressed by the equation, ''F = ma'', where ''F'' is the net force acting on an object of mass ''m'' with acceleration ''a''. Alternatively, if an object of mass ''m'' has an acceleration ''a'' (change in velocity with time) then the net force ''F'' acting upon that object is the product of its mass and acceleration.
  
This law is expressed by the equation, ''F = ma'', where ''F'' is the net force acting on an object of mass ''m'' with acceleration ''a''. Alternatively, if an object of mass ''m'' has an acceleration ''a'' (change in velocity with time) then the net force ''F'' acting upon that object is the product of its mass and acceleration.
   
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'''Newton's 3<sup>rd</sup> law of motion'''
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===Newton's 3<sup>rd</sup> law of motion===
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Every action has an equal and opposite reaction.
   
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====Explained====
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''Every action has an equal and opposite reaction.''
  
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This law states that if a force is applied by an object A upon another object B, then object B will also exert an equal and opposite force on object A.
   
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[[Category:Physics]]
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This law states that if a force is applied by an object A upon another object B, then object B will also exert an equal and opposite force on object A.
  

Revision as of 05:24, 10 March 2006

Newton's laws of motion are a set of physical laws discovered by Sir Isaac Newton [[1]] which describe the motion of objects.

Laws of motion

Newton's 1st law of motion
Newton's 2nd law of motion
Newton's 3rd law of motion

Description

Newton's 1st law of motion

Every object or body continues to be in its state of rest or of motion unless acted upon by an external unbalanced force.

Explained

Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.

This law describes the inertial nature of any object. It says that any object has inertia on account of its state of motion and that inertia remains unchanged until the object is acted upon by an external force.

For example, on a frictionless surface, a ball would continue to remain at rest until pushed and once in motion, it will continue moving in a straight line until a force causes it to stop or change direction.

Newton's 2nd law of motion

The rate of change of momentum of a body is equal to the force applied to that body and in the direction of the force.

Explained

The acceleration of an object is directly proportional to the force applied to that object, in the direction of the force.

This law is expressed by the equation, F = ma, where F is the net force acting on an object of mass m with acceleration a. Alternatively, if an object of mass m has an acceleration a (change in velocity with time) then the net force F acting upon that object is the product of its mass and acceleration.

Newton's 3rd law of motion

Every action has an equal and opposite reaction.

Explained

This law states that if a force is applied by an object A upon another object B, then object B will also exert an equal and opposite force on object A.

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