Momentum Intro Quiz

Remember that p=mv

1. What is momentum?

2. Calculate the momentum in the following problems and put your answer in kg∙m/s. a. What is the momentum of a 6890 kg train moving down the tracks at 5 m/s south? b. What is the momentum of a 50 kg woman running at a velocity of -4 m/s? c. What is the momentum of a 1 x 108 gram car moving at a velocity of 2.5 x 101 m/s northwest?

3. What is the mass of a skateboarder who is moving at a velocity of 8 m/s north with a momentum of 400 kg∙m/s?

4. Is momentum a vector or scalar quantity?

5. Draw momentum vectors for the following problems. Use a vector key of 1 cm = 100 kg∙m/s.

a. A biker moves down the road at 5 m/s west. The biker and the bike have a total mass of 80 kg. b. A 120 kg bear walks up the road at 4 m/s east. c. Which has a greater momentum?

6. What is the relationship between impulse (F ∆t) and change in momentum (m ∆t)? 7. You are at a Dodger game. Nomar Garciaparra just hit a home run and it is coming straight for you. If you want to catch the baseball without hurting your hand (read least amount of force) how should you catch it? Explain in terms of impulse.