Simple explanation of Force | Newton's 2nd law of motion

What is Force?


 The simplest way to define force as:
  •  Force - Any action that tends to maintain or alter the motion of a body is called force.

Man applying Force


As seen in the picture above block is in rest initially and a man pushes it to move, that push is known as force.

More scientifically Newton state the force as:


Newton's 2nd law of motion:


  • Rate of change of momentum is called force.
Or
  • we can say that for a constant mass force is directly proportional to acceleration.
we knew that momentum is defined as multiplication of mass and velocity of matter. so, change in momentum is mass multiply by change in velocity.

momentum change = m(v2– v1)


                                                   SI unit
F = (mv2– mv1)            mass (m) - kg
              t                      velocity (v) - m/s                                      
F = m(v2-v1)                  time (t) - s   
             t                         so, F =kg-m   = N
F = m*a                                                s2  

SI unit of force is Newton (N)                          
                                                   
Where:

F: force applied
m: mass of body
V1: velocity of body before applying force
V2: velocity of body after applying force
t: time
a: acceleration



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