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Momentum Homework 1. Momentum depends on two variables; they are _________ and ___________. 2. A moving car has momentum. If it moves twice as fast, its momentum is ___________ as much. 3. Two cars, one twice as heavy as the other, move down a hill at the same speed. Compared to the lighter car, the momentum of the first car is _______________. 4. Two cars, one twice as heavy as the other, move down a hill at the different speeds. If the two cars have the same momentum, which car has the higher speed? How do you know? 5. Two cars, one twice as heavy as the other, move down a hill at the different speeds. Is it possible to determine which car has more momentum? Please explain. 6. Can a tennis ball have the same amount of momentum as a car? Please explain. 7. What is the momentum of a dog that runs 8 m/s? Assume the mass of the dog is 15 kg. 8. A 60 kg 9th grader runs with an average speed of 6 m/s. What is her momentum? 9. A car travels 160 meters in 8 seconds. The car has a mass of 900 kg. a. What is the average speed of the car? b. What is the momentum of the car? 10. Which of the following cars has the most momentum? Car #1 has a mass of 1200 kg and a speed of 12 m/s Car #2 has a mass of 1000 kg and a speed of 14 m/s Car #3 has a mass of 1500 kg and a speed of 10 m/s 11. A car travels at a speed of 10 m/s. a. If the car has a mass of 1000 kg, what is the momentum of the car? b. If the car from problem #8 goes twice as fast, how much momentum does it have? c. If instead, the car had a mass of 500 kg, what would be the momentum at its original speed? 12. A boy with a mass of 40-kg is running. a. If he runs at a speed of 5 m/s, what is his momentum? b. If his sister has a mass of 30-kg, how fast would she have to run to have the same momentum as the boy? 13. A cart with a mass of 20 kg is traveling at 5 m/s then speeds up to 8 m/s. a. What is the cart’s original momentum? b. What is the cart’s new momentum? c. What was the change in the carts momentum? d. Did the momentum increase or decrease by the amount in part c? e. What is the change in velocity of the cart? f. If you take the change in velocity from part e and multiply it by the mass you will also find the change in momentum. Do this and determine what the change in momentum of the cart is. g. What do you notice about your answers to part c and f?

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