Momentum and Impulse Problems Packet

Name ______

Momentum Problems:

  1. Draw the memory circle for momentum
  1. What are the units for EACH variable?
  1. How much momentum does a 100kg train have when traveling 6 m/s?
  1. How fast must a car that has a mass of 20 kg move in order to have the same momentum as the train?
  1. How much mass does a ball have that has a momentum of 85 kgm/s when traveling 16 m/s?
  1. How much momentum does a 30 N box have when traveling 18 m/s?
  1. Which has more momentum: a 300 kg train traveling 2 m/s or a 100 kg bus traveling 6 m/s? Show all work!

Impulse Problems

  1. Draw a memory circle for impulse
  1. What are the units for EACH variable?
  1. How much impulse does a 50 N force have over 2 seconds?
  1. What is another way to calculate impulse?
  1. How much impulse does an object have it is goes from a momentum of 30 kgm/s to 22 kgm/s?
  1. What is the momentum of 9 kg ball rolling 12 m/s?
  1. What is the force of that ball if it impacts for 0.6 sec?
  1. How much force must an object have if it goes from 6 kgm/s to 0 kgm/s during a slide of 12 seconds?

Mixed Problems – They get challenging!!!

  1. What is the momentum of a 30 kg hockey player skating at 5 m/s across the ice?
  1. How much would another player weigh if he was going 8 m/s across the ice in order to have the same momentum?
  1. How much force would occur if the collision of the second player took 0.2 sec to come to a complete stop?
  1. What is the impulse of a 60 kg brick that hits a pillow at 20 m/s and is cushioned for 3.1 seconds?
  1. What is the mass of an object that took 30 N of force to stop over 2.5 seconds while going 5 m/s? (two separate problems!!)
  1. What has more mass, a train going 60 m/s with a momentum of 25 kgm/s, or a car going 100 m/s with a momentum of 10 kgm/s?
  1. How are momentum and impulse the same? Different?
  1. Give an example of momentum in real life.
  1. Given an example of impulse in real life.
  1. A force of 30000 N is exerted for 4.00 s, on a 95,000 kg mass.
    (a) What is the impulse of the force for this 4.00 s?

(b) What is the mass's change in momentum from this impulse?

(c) What is the mass's change in velocity from this impulse?

11. A freight car weighing 25 tons runs into another freight car of the same weight. The first was moving at 6 mi/hr (8.8 ft/sec) and the second was at rest. If the cars are coupled together after the collision, what is their final speed?

m1v1i + m2v2i = (m1 + m2) vf

12. Two blocks are travelling toward each other. The first has a speed of 10 cm/sec and the second a speed of 60 cm/sec. After the collision the second is observed to be travelling with a speed of 20 cm/sec in a direction opposite to its initial velocity. If the weight of the first block is twice that of the second, determine: (a) the velocity of the first block after collision; (b) whether the collision was elastic or inelastic.

  1. What is the momentum of a 4 kg object moving at 3 m/s?
  1. What is the impulse if that object comes to a complete stop?
  1. How much force is required to stop that object in 5 seconds?
  1. What is the weight of that object?
  1. What is the coefficient of friction for that object if 200 N of force is required to move it at a constant speed?
  1. What velocity must a 10 N ball have in order to achieve the same momentum as #1? (Hint: two formula circles)
  1. How much time does it take to stop a 6 kg FALLING object if it has a momentum of 300 kgm/s and a net force of 10 N stops it from falling?
  2. What is the momentum of a 50 kg hockey player skating at 6 m/s across the ice?
  1. How much would another player weigh if he was going 12 m/s across the ice in order to have the same momentum?
  1. How much force would be applied to each player if the collision of the second player took 2.2 sec to come to a complete stop?
  1. What is the impulse of a 35 kg brick that hits a pillow at 2 m/s and is cushioned for 4.6 seconds?
  1. What is the mass of an object that took 22 N of force to stop over 3.2 seconds going 5 m/s? (two separate problems!!)
  1. What has more mass, a train going 23m/s with a momentum of 25 kgm/s, or a car going 100 m/s with a momentum of 10 kgm/s?
  1. How are momentum and impulse the same? Different?