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

6 Questions | Total Attempts: 50  Settings  2. 2. 12 Conservation of linear momentum / Newton's 3rd Law

• 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
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