Moment

• Moment

  The rotational or turning effect of a force

  m=moment(N/m)

  F=Force(N)

  d=distance( m)

  $m=$$Fd$
• Principles of Moments

  If an object is balanced the sum of the moments turning clockwise must be equal to the sum of moments going anti clockwise about the same pivot
• Conditions of equilibrium

  The sum of the force in one direction equals the sum of the force in the opposite direction

  When there is no resultant force and resultant movement an object is in equilibrium
• Centre of gravity

  The point at which the weight of the entire object is concentrated
• Momentum

  The product of a mass of body and its velocity

  unit=kgm/s
• $P=$$mv$

  p=momentum

  m=mass

  v=velocity
• Law of condensation of momentum states that momentum before is equal to momentum after
• Force and Momentum

  Force can be calculated by Taking into account Newton’s second law of motion
• F=mv-mu/t

  F=force

  t=time

  
• Impulse

  Change in momentum of an object measured in Ns(newton seconds)

  Impulse=Force x time

  $Impulse=$$Ft$
• Impulse is a vector quantity therefore it has magnitude and direction