momentum

• momentum = mass x velocity


  p = mv
• With a resultant force on it, an object will accelerate. Therefore, its velocity will change, and so will its momentum.


  resultant force = change in momentum/ time
• Impulse = force x time


  force x time = change in momentum

  impulses = change in momentum
• resultant force = rate of change of momentum
• force x time = mv - mu

  Ft = m(v-u)
• The bigger the force and the longer it acts for, the more the object’s motion will change The impulse equation sum this up_

  Ft = mv – mu
• NEWTON'S LAWS OF MOTION

  • The bigger the force acting on an object, the faster the object will speed up.
  • Objects with greater mass require bigger forces than those with smaller mass to make them speed up (accelerate) at the same rate.
  • The force referred to is the resultant force acting on the object.
  • The relationship F = m x a is a consequence of Newton's second law.
• NEWTON'S THIRD LAW: ACTION AND REACTION

  • When you push something it pushes you back just as hard, but in the opposite direction.
  • For every action there is an equal and opposite reaction.
  • When you sit down, your weight pushes down on the seat. The seat pushes back on you with an equal, but upward, force.
  • It can sometimes be difficult to sort out action and reaction forces from balanced forces.
  • Balanced forces act in opposite directions on the same object.
  • Action and reaction forces also act in opposite directions, but are always acting on different objects.
• The period of deceleration time must be large to reduce the force of damage
• when two or more objects act on each other, their total momentum remains constant , provided no external forces are acting.