Momentum

• What is momentum a property of?

  All moving objects
• What does momentum depend on?

  Mass and velocity
• What is the formula for momentum?

  momentum = m x v
• What does it mean that momentum is a vector quantity?

  It has both magnitude and direction
• What is the momentum of an object at rest?

  0 momentum
• What factors contribute to greater momentum?

  Large mass or higher velocity
• What does the conservation of momentum state in a closed system?

  Total momentum before equals total after
• How is total momentum calculated before an event?

  Total momentum = (mxv) + (mx0)
• What happens when a resultant force acts on an object?

  It changes the object's momentum
• What is the formula for change in momentum?

  Change in momentum ÷ change in time
• What does a larger force indicate in terms of momentum?

  Greater rate of change of momentum
• What materials are needed for investigating collisions?

  • 2 trolleys
  • Light gates
  • Data loggers or ticker timers
  • Measuring tape
  • Weights (to vary mass)
• What is the procedure for investigating collisions with trolleys?

  1. Set up trolleys on a smooth track.
  2. Attach light gates to measure velocity.
  3. Push trolley into center to collide.
  4. Record mass and velocities before/after.
  5. Use momentum equation to calculate total momentum.
• What is the expected outcome of the collision experiment?

  Total momentum before equals after collision
• What is the formula for total momentum in a collision?

  M = mA x vA + mB x vB
• What is the formula for force?

  Force = mass x acceleration
• What are the units for momentum?

  kgm/s
• How is acceleration calculated?

  Change in velocity ÷ time