Gravity Movie questions and Movie

 HERE

Movie HERE

More Momentum Practice

 Impulse, Momentum and Conservation of Momentum

Momentum (P) and Impulse (J)

Momentum = mv Ft = m∆v or also as Ft = m(Vf — Vi)

Impulse = Ft m∆v = Change in momentum

Conservation of momentum Pbefore = Pafter

1. What is the change in momentum caused by a 35 Newton force to the right acting on a mass for 5 sec?

2. A freight train moves with a velocity of 17 m/s to the North. The mass of the train is 6000000 kg. What would have to be the velocity of a 2000 kg car if the car were to have the same momentum?

3. A 300 kg mass is moving to the right at a velocity of 20 m/s. All of a sudden (for no explicable reason) the mass of the object triples. What happens to the velocity?

4. A force acting on a 5 kg body increases its speed uniformly from 2.0 m/s to 8.0 m/s through 5 seconds.

a) What is the initial and final momentum of the body?

b) What impulse did the body receive?

5. How long must a 50 N force act on a 400 kg mass to raise its speed from 10 m/s to 12 m/s?

6. A woman drives a .045 kg golf ball off of a tee and gives the ball a velocity of 28 m/s to the right. The impact of the club on the ball lasts for 0.006 seconds.

a) What is the change in momentum of the ball?

b) What is the force of the club on the ball? 

7. A .2 kg ball is traveling at 5 m/s and hits you in the face and comes to a stop in .02 seconds. What is the force on your face?

8. A .2 kg ball is traveling at 5 m/s and hits you in the face and bounces off in 0.02s and is now traveling in the opposite direction at 5 m/s. What is the force on your face?

9. A raindrop has a mass of .000034 kg and is falling at a velocity of 7 m/s and comes to a stop when it hits your umbrella in .02 seconds.

a. What is the force on your umbrella?

b. If 50 raindrops hit your umbrella at the same time what is the total force on your umbrella?

1) 175kg m/s 2) 51,000m/s 3) 6.67m/s 4) a) 10kg m/s, 40kg m/s  b) 30 Ns 5) 16s 6) a) 1.26 kg m/s b) 210N 7) -50N 8) 100N 9) a) 0.0119N  b) 0.595N

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