Momentum Lab

Momentum

• ​slides that follow are mix of NOTES & problems

• need calculator, scratch paper, your MOMENTUM NOTES

LAW OF CONSERVATION OF MOMENTUM:

• ​For any interaction occurring between object 1 and object 2 in an isolated system, the total momentum of the two objects before the collision is equal to the total momentum of the two objects after the collision.

  • ​conserved means total does not change - but each piece may change.

  • must be careful with positives and negatives for velocity

  • isolated system: means no outside forces - just the two objects affecting each other.

​Equations in box are same as ones on Momentum Notes.

​WARM-UP QUESTIONS

ARE YOU READY?​

Multiple Choice

Which letter in these equations stands for momentum?

• m

• p

• J

• F

• t

Multiple Choice

Which letter in these equations stands for Impulse?

• m

• p

• J

• F

• I

Multiple Choice

What does the m stand for in the first equation?

• meters

• milli-

• mass

• momentum

p = momentum (unit: kg-m/s )

m = mass (unit: kg)

v = velocity (unit m/s)

J = Impulse (unit kg-m/s or N-s)(

F = Force (unit: N)

t = time (unit: seconds)​

Δ​ = delta = "change in" = final minus initial

​

Multiple Choice

A 2 kg soccer ball is moving to the right at 3m/s. What is the 3 m/s

• mass

• momentum

• velocity

• impulse

Multiple Choice

A 2 kg soccer ball is moving to the right at 3m/s. What is the ball's momentum?

• 1.5 kgm/s Left

• 5 kgm/s Right

• 6 kgm/s Right

• 6 kgm/s

Multiple Choice

A 800 kg car is driving to the right at 10 m/s.

What is the 800kg??

• momentum

• velocity

• Impulse

• mass

Multiple Choice

A 800 kg car is driving to the right at 10 m/s. What is the car's momentum?

• 10 m/s Right

• 80 kgm/s Right

• 8,000 kg m/s Right

• 80,000 kgm/s right

Multiple Choice

Scott's 600 kg car is broken down. He gives the car a 200 N push to the left for 10 seconds. What is the number 200N?

• mass

• momentum

• Force

• Impulse

Multiple Choice

Scott's 600 kg car is broken down. He gives the car a 200 N push to the left for 10 seconds. Calculate the car's change in momentum?

• 2,000 kgm/s LEFT

• 6000 kgm/s LEFT

• 120000 kgm/s LEFT

• Cannot be determined.

Multiple Choice

A 90 kg bicyclist is moving East at 10 m/s.

He applies the brakes for 10 seconds.

The cyclist is now moving East at 6 m/s.

What was the cyclists initial momentum?

• 9 kgm/s East

• 540 kgm/s East

• 900 kg m/s East

• 54,000 kgm/s East

Multiple Choice

A 90 kg bicyclist is moving East at 10 m/s.

He applies the brakes for 10 seconds.

The cyclist is now moving East at 6 m/s.

What was the cyclists final momentum?

• 9 kgm/s East

• 540 kgm/s East

• 900 kg m/s East

• 45,000 kgm/s East

Multiple Choice

A 90 kg bicyclist is moving East at 10 m/s.

He applies the brakes for 10 seconds.

The cyclist is now moving East at 6 m/s.

Initial momentum = 900 kgm/s

Final momentum = 540 kgm/s

What was the cyclists change in momentum?

• -360 kgm/s

• +360 kgm/s

• +900 kg m/s

• +1440 kgm/s

Multiple Choice

A 90 kg bicyclist is moving East at 10 m/s.

He applies the brakes for 10 seconds.

The cyclist is now moving East at 6 m/s.

Change in momentum = -360 kgm/s (west)

What was the average Force acting on the cyclist while he slowed down?

• 36 N East

• 36 N West

• 90 N East

• 90 N West

Poll

CHECK-IN: HOW ARE YOU DOING WITH THESE PROBLEMS.

• ALMOST ALL CORRECT

• MOST CORRECT

• SOME CORRECT

• MOSTLY INCORRECT/UNFINISHED/CONFUSED

Multiple Choice

A 200,000 kg train is traveling at 30 m/s North. Spiderman uses his webs to exert a total force of 10,000 N SOUTH on the train to slow it down.

What is the 30 m/s North?

• mass

• momentum

• initial velocity

• final velocity

Multiple Choice

A 200,000 kg train is traveling at 30 m/s North. Spiderman uses his webs to exert a total force of 10,000 N South on the train to slow it down.

If spiderman exerts this force for 1 minute (60 seconds) then what is the train's change in momentum??

• 10,000 kgm/s North

• 30,000 kgm/s South

• 300,000 kgm/s North

• 600,000 kgm/s South

Multiple Choice

A new mom is walking at 1 m/s West while pushing a 30 kg baby & carriage.

She then decides to speed up and pushes the cart harder during a 12 second burst of power.

After the 12 seconds the baby and carriage are moving at 5 m/s West. Calculate the amount of force the mom used. (solve on scratch paper and then choose your answer below )

• 10 N West

• 12.5 N West

• 72 N West

• 90 N West

Multiple Choice

The 800 kg yellow car was traveling at 20 m/s to the right when it rear ended by the 600 kg green car that was traveling at 40 m/s to the right. Which car will have the largest change in momnetum?

• Yellow Car

• Green Car

• Both cars have same change in momentum

• Cannot tell without more information.

Multiple Choice

The 60 kg ice skater (on the left) and the 90 kg ice skater (on the right) are at rest and have their hands touching. They then push off of each other and both move backwards. The total momentum of the two skaters after they push off will be:

• 0

• to the right

• to the left

• cannot tell