2.2.12 Conservation Of Linear Momentum / Newton's 3rd Law

6 Questions | By Gboulton | Updated: Mar 20, 2022 | Attempts: 134

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2. 2. 12 Conservation of linear momentum / Newton's 3rd Law

Questions and Answers

1.

Which is the best wording to describe the conservation of momentum
- A.
  
  Momentum before a collision is the same as the momentum after the collision
- B.
  
  Momentum before a collision is the same as the momentum after the collision if there are no external forces
- C.
  
  The total momentum before a collision is equal to the total momentum after a collision
- D.
  
  The total momentum before a collision is equal to the total momentum after the collision if the total external forces acting upon the system is zero.
2.

In explosion type collision, two static trolleys of masses 2Kg and 3Kg start to move apart (pushed by a spring between them), What is the velocity of the first trolley if the 3Kg trolley moves with velocity 4m/s?
- A.
  
  3m/s
- B.
  
  -3 m/s
- C.
  
  4 m/s
- D.
  
  -4 m/s
- E.
  
  6 m/s
- F.
  
  -6 m/s
3.

Why does a gangstah (note new spelling) not actually fly back through a glass window when he "takes" a bullet
- A.
  
  The bullet is travelling too fast
- B.
  
  He might will be wearing a bullet proof vest
- C.
  
  The total momentum before he is it is too small to make a significant change in his velocity
- D.
  
  The bullet gives all the momentum to the person that fired the bullet.
4.

If the gangstah stands on the pavement, which are newton's third law pair of forces
- A.
  
  The gansta pushes down on the ground, and the ground pushes up on the gansta (reaction)
- B.
  
  The earth pulls down on the gangster, and the pavement pushes up on the ganster
- C.
  
  The ganster's mass pulls up on the earth, and the ground pushes up on the gangster.
5.

According to newton's 3rd Law, If I push a car forward,
- A.
  
  The car will accelerate slowly
- B.
  
  The car will move at constant velocity
- C.
  
  The car will not move at all
- D.
  
  The car will push me back
- E.
  
  I have been taking too many high energy drinks.
6.

Are there any parts of the conservation of momentum and Newton's 3rd Law that needs to be reviewed next lesson? Can you formulate a question