# HP Cycle 26

## 2/12 - 2/15

M 2/12

T 2/13

W 2/14

Th 2/15

### 🟢 5: M 2/12 - conservation of momentum

Today, we’ll first discuss how we a system with no impulse will conserve momentum.  We'll start by exploring momentum conservation in "explosions."  Then, we'll continue to discuss elastic and inelastic collisions and then do a few problems.  Remember that momentum is conserved in all collisions, but energy is only conserved in elastic collisions.  Also remember that in a collision between two objects, each of the objects experiences an equal impulse (the momentum equivalent to Newton's 3rd Law).

PresentationCollisions (we'll do some sample problems found here)

Homework:  Finish the ↩️ Pivot Lab "Ball Rebound" by tonight - Monday, February 12th at 10pm.

If you need extra support on today's lesson or if you missed today's lesson for any reason, check out the following videos which could be helpful in catching you up on understanding collisions.

And here is another video which helps to illustrate the difference between elastic and inelastic collisions.  Make sure you make it to the end of the video when he talks about the real-world caveat at around 6:00.

### 🟩 5: T 2/13 - collisions

Today, we'll finish talking about elastic and inelastic collisions and then do a few problems.  Remember that momentum is conserved in all collisions, but energy is only conserved in elastic collisions.  Also remember that in a collision between two objects, each of the objects experiences an equal impulse (the momentum equivalent to Newton's 3rd Law).

PresentationCollisions (we'll do some sample problems found here)

HomeworkOptionally review the two videos below.  QUIZ on Impulse and Momentum in 1-D on Friday, February 23rd.

Optional extra practicepages 2 and 3 in Momentum Packet.  (SOLUTIONS to Cons Momentum CompuSheet & SOLUTIONS to Momentum Practice Problems p 3)

In the following video, the chart is a useful method, but if you'd rather express the conservation of momentum as an equation like we did conservation of energy, that would be acceptable and probably faster.  Focus on understanding the concepts of momentum conservation here.

Below is an example of how to solve a perfectly inelastic collision the equation way, which is preferred over the chart method.

### 💚 5: Th 2/15 - 📖 collision problems

Today, we'll solidify our understanding of collision problems by completing 📖 Mastering Physics "Ch 9 - Collisions" problems:  #C9, C17, 8, 19, 21, 22, 30, 54, 64, 66, 69.

Optional extra practicepages 2 and 3 in Momentum Packet.  (SOLUTIONS to Cons Momentum CompuSheet & SOLUTIONS to Momentum Practice Problems p 3)

Homework:  New policy - no late work will be accepted after the unit assessment.  Finish 📖 Mastering Physics sets - "Ch 9 - Collisions" by Tuesday, February 20th at 10pmQUIZ on Impulse and Momentum in 1-D next class - Wednesday, February 21st .