# HP Cycle 28

## 2/28 - 3/3 M 2/28 T 3/1 W 3/2 Th 3/3

### 🟢❗ 6: M 2/28, 🔵❗ 8: M 2/28 - energy assessment

Assessment on all of Work and Energy Today!

Homework: Finish problems from ➕ Positive Physics unit 14: momentum "work" problems from the following sections only:

• definition of momentum

Finish these problems by Friday at 10pm. You may not yet be able to answer the main questions on every problem, but try to at least fill out the m, v, and p values for each point in time. Only completion score counts. No late work will be accepted.

### 🟩 6: W 3/2, 🟦 8: T 3/1 - 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).

Presentation: Collisions (we'll do some sample problems found here)

Homework: Do problems from ➕ Positive Physics unit 14: momentum "work" problems from the following sections only:

• conservation of momentum - 18 quick problems

Finish these problems by Friday at 10pm. Only completion score counts. No late work will be accepted.

### 💚 6: Th 3/3, 💙 8: W 3/2 - collisions

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).

Presentation: Collisions (we'll do some sample problems found here)

Homework: Do problems from ➕ Positive Physics unit 14: momentum "work" problems from the following sections only:

• conservation of momentum - 18 quick problems

Finish these problems by Friday at 10pm. Only completion score counts. No late work will be accepted.

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

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.

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.