Momentum and Impulse

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Linear Momentum-defined as product of mass and velocity Units-Kgms^-1 or Ns^-1

P=mv

 Conservation of linear momentum-if no external forces act on a system of colliding objects, the total momentum of the object remains constant.

Total momentum before collision=total momentum after collision

-if stationary at start m2v2=0

-m1v1+m2v2=(m1+m2)v3

Momentum is a vector quantity                                           

Oblique collisions-velocitiesresolvede into perpendicular components then each direction considered separately

Momentum only conserved if no external forces act-i.e-no friction

Impulse=Ft Units=Ns

  • Force applied, object accelerates
  • Force

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