# Unit 7 Part 3: Combining Momentum and Energy

Week 14 Lesson 1 (90 minutes):

 Lesson Objective: To combine the concepts of Potential, Potential Energy, and Kinetic Energy and to calculate Momentum. Learn Elastic and Inelastic colissions. Standards: CA PH 1f, l*, PH 2a,b Warm Up: {FM-on index card} Calculate the Work done to move a ball of 10kg mass to the top of a 20 m high ramp. Agenda: Combining potential and kinetic energy. Review concepts of potential, potential energy, and kinetic energy from before the Thanksgiving break.Modeling and Guided Practice to reinforce above concepts.Extend knowledge to conversion of potential energy to kinetic energy. Show equivalence of straight 1/2  ramp and parabolic ramps by deriving kinetic energy and velocity at the bottom of the ramp for both cases.Additional extension – time permitting – to small angle circular ramp, equivalence to mass pendulum. Introduce Galileo’s principles of T vs L (not m). Exit Assessment: If the ball in the warm up problem rolls down the ramp, calculate its Kinetic Energy when it reaches the bottom of the ramp. Using its Kinetic Energy, calculate the ball’s velocity. Lecture Notes: Review juggler KE + PE Ch 11 pg 295. Refernce pg 296 GPE=mgh.Model: Ex Prob 1 pg 297GP: Sample probs pg 299 1-5 Mention inertial and gravitational mass, mass energy equivalency pg 299 as this satisfies a standard. DI: Elastic Potential Energy, compare and contrast Elastic and Inelastic. pg 301: Conservation of mechanical energy. esp. pg 303 diagrams. Discuss problem solving strategies pg 304 Model Ex Prob 2 pg 304 GP: practice prob #18 – skiing — board work Homework: either pg 315 Mixed review #83-90 or worksheet from teacher resources ch 11.

Week 14 Lesson 2 (60 minutes):

eek 14 Lesson 3 (90 minutes):