Lesson 20.1

• Momentum


  The quantity of motion an object has
• Momentum


  The product of an object's mass and velocity
• Momentum

  Also known as translational momentum or linear momentum
• All objects in motion possess momentum
• Momentum

  • The amount of momentum depends on two variables: how much object is moving (mass) and how fast the object is moving (velocity)
• An object at rest does not have momentum
• Mass


  How much matter an object contains
• More massive an object is

  The more momentum it will have
• Velocity


  The speed of an object in a particular direction
• Faster an object is moving


  The more momentum it will have
• Momentum is "mass in motion"
• Momentum

  Equal to the mass of the object times the velocity of the object
• Momentum is measured in kilograms meters per second (kg m/s)
• Two objects with equal velocity but different masses

  Have different amounts of momentum
• Momentum


  • It is a vector quantity
  • It follows the direction of the object's velocity
• When an object's velocity changes

  Momentum also changes
• When an object does not move or its velocity is zero


  Its momentum is zero
• The amount of an object's momentum


  Is the same amount of force needed to stop it
• Momentum


  Measure of an object's motion, obtained from the product of mass and velocity
• Impulse


  • Force applied by an object to another that causes it to move at a given time interval
  • Change in momentum of an object
• If mass is constant

  Higher velocity means greater momentum, lower velocity means smaller momentum
• If velocity is constant

  Greater mass means greater momentum, smaller mass means smaller momentum
• Mass and velocity


  Directly proportional to an object's momentum
• Collision between two cars

  • Impulse is the average impact force of the collision
  • Impulse is determined by the average force applied during the collision over a certain time interval

  
• Impulse is derived from Newton's law of acceleration
• Impulse is the change in momentum of an object