Newton's law of motion

Newton's first law of motion
It sates that "everybody continues in its state of rest or uniform motion along a straight line unless an external force is applied on it". Some examples of the first law of motion are
1. When we shake a mango tree, the mangoes fall down.
2. A bullet fired on a window pane makes a clear hole on it without causing cracks. etc.
Newton's second law of motion
It states that "acceleration produced in a body is directly proportional to the force applied to it in the direction of motion and inversely proportional to its mass".
Let us consider an object having mass 'm' and if we applied a force 'F' then this force produces an acceleration 'a' in that body.
According to the statement,
       a~ F        ....... i
       a~ 1/m    ....... ii
Combining these two equations, we get
       a~F/m
       F~ ma    .......iii( ~ it represent                                                          porportionality)
      F = kma ......iv where k is the proportionality constant.
If m=1unit, a= 1 unit and F = 1 unit then on substituting these values in the equation iv we get,
1 = k x 1 x 1
k = 1
Then equation iv becomes,
   F= ma    ..... v
This relation represent the mathematical statement of the newtons second law of motion.
The force acting on a body of mass 1 kg produces an acceleration of 1 m/s*2, which is called one newton force.
Some examples of second law of motion
1. A cricket player while catching a ball moves his hands backwards.
2. It is easier to drag a stone than to kick it.
Newton's third law of motion
It states that" to every action there is an equal and opposite reaction".

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