HP Cycle 29

🟢 6: Th 3/4, 🔵 8: F 3/5 conservation of energy examples

Today, we'll discover the interesting thing about the conservation of energy by doing a few problems which will require you to remember everything you have learned so far this year. We will learn that there are usually a few different ways of solving physics problems - with forces and kinematics or with work and energy. We will discover when it is best to use either strategy.

Homework: Upload your notes to ✏️ Google Classroom by Monday at 10pm.

Optional Extra Practice: Work & Energy Packet - page 3 only (Unit 6 CompuSheets Answers)

🟩 6: F 3/5, 🟦 8: M 3/8 work by non-conservative forces

Today, we will look at some problems where we can use our knowledge of kinetic and gravitational potential energy to solve complex kinematics problems. Conservation of energy is a useful tool and a alternative to using Newton's Laws and kinematics. Remember that work and energy are scalar quantities.

Presentation: Conservation of Energy Examples (we'll focus on the last two slides)

Optional Extra Practice: Work & Energy Packet page 4 #1-5 (Solutions to FYP: Energy).

💚 6: T 3/9, 💙 8: T 3/9 ➕ Positive Physics energy problems

Today, we'll practice all we've learned about work and energy by doing ➕ Positive Physics unit 13: energy "work" problems from the following sections:

• energy identification 1

• complete problems 1

• complete problems 2

• complete problems 3

NOTE: Positive physics uses some unconventional vocabulary:

• "work" means positive work done by a non-conservative force.

• "loss" means negative work by a non-conservative force.

We will have a little more time to work on these problems before the end of the week.

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