P = mv F ∆ t = p f - p i p Ci + p Di = p Cf + p Df.

Momentum Practice(2/25-26: 1-18)

p = mvF∆t = pf - pi

pCi + pDi = pCf + pDf

1. Calculate the momentum of a 0.15 kg ball that is moving toward home plate at a velocity of 40m/s.

2. Which has greater momentum, a 2.0kg hockey puck moving east at 2.5m/s or a 1.3kg hockey puck moving south at 3.0m/s?

3. A track athlete throws a 2kg discus into a field with a velocity of 21m/s. What is the momentum of the discus?

4. Calculate the momentum of a 700g ball that is rolling down a ramp at 4.6m/s.

PRACTICE PROBLEMS :

5. A cannon fires a 40.5kg shell toward a target and the shell moves with a velocity of 120m/s. Calculate the shell's momentum.

6. A 147.25 kilogram motorcycle is moving at a speed of 69.75 m/s. What is the momentum of the cycle?

7. If the motorcycle above crashes into a wall and stops in a time of 0.05 seconds, how much force acted on the cycle to bring it to a stop?

PRACTICE PROBLEMS :

8. A small car (mass = 147.25 kilograms), moving at 108.5 m/s, crashes head on with a 589 kilogram truck moving at -69.75 m/s in the opposite direction. If the two cars become intertwined and mangled (inelastic), with what velocity does the wreckage move? (Don't forget direction!)

PRACTICE PROBLEMS :

9. Calculate the momentum of a 12kg car with a velocity of 25m/s.

10. What is the momentum of a child and wagon if the total mass of the child and wagon is 22kg and the velocity is 1.5m/s?

11. The parking brake on a 1200kg automobile has broken, and the vehicle has reached a momentum of 7800kg.m/s. What is the velocity of the vehicle?

12. A toy dart gun generates a dart with 0.140kg.m/s momentum and a velocity of 4m/s. What is the mass of the dart in grams?

PRACTICE PROBLEMS :

13. A bowling ball of 35.2kg, generates 218 kg.m/s units of momentum. What is the velocity of the bowling ball?

14. A school bus traveling at 40 km/hr. (11.1m/s) has a momentum of 152625 kg.m/s. What is the mass of the bus?

15. A 12,000kg. railroad car is traveling at 2m/s when it strikes another 10,000kg.railroad car that is at rest. If the cars lock together, what is the final speed of the two railroad cars?

PRACTICE PROBLEMS :

16. A 9,300 kg. railroad car traveling at a velocity of 15m/s strikes a second boxcar

at rest. If the two cars stick together and move off with a velocity of 6m/s, what the mass of the second car?

17. A 25 gram bullet is fired from a gun with a speed of 230m/s. If the gun has a mass

of 0.9kg. what is the recoil speed of the gun?18. A 20 gram bullet traveling at 250m/s

strikes a block of wood that weighs 2kg.With what velocity will the block and bullet

move after the collision?

PRACTICE PROBLEMS :

PRACTICE PROBLEMS :

P = mv F ∆ t = p f - p i p Ci + p Di = p Cf + p Df.

Documents

Transcript of P = mv F ∆ t = p f - p i p Ci + p Di = p Cf + p Df.