Momentum

• What is the definition of momentum for moving objects?

  All moving objects have momentum.
• What is the momentum of an object that is not moving?

  The momentum is zero.
• How is momentum calculated?

  • Momentum = mass × velocity
  • Unit of momentum: kilogram m/s
• What is the unit of momentum?

  kilogram m/s
• Why is it important to learn the momentum equation for exams?

  Because the equation is not given in the exam.
• If a car has a mass of 1,000 kg and is not moving, what is its momentum?

  Zero.
• How do you calculate the momentum of a car with a mass of 1,000 kg moving at 20 m/s?

  20,000 kg m/s.
• What is the principle of conservation of momentum?

  • Total momentum before an event = Total momentum after an event
  • Applies in a closed system
• How does the momentum of a moving van compare to a stationary car before a collision?

  The van has momentum; the car has none.
• What happens to the total momentum of the van and car after they collide?

  The total momentum is conserved and remains the same.
• What occurs to the momentum of a cannon and cannonball before and after firing?

  The total momentum remains zero before and after firing.