# Chapter 2, Section 8 Potential and Kinetic Energy: Energy in the Pole Vault.

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Chapter 2, Section 8 Potential and Kinetic Energy: Energy in the Pole Vault

November 1, 2010 HW: 2.8 PTG #1, 2, 3, 6, 7, 8, 13, Due Friday Learning Objectives:  Describe kinetic, gravitational potential, and elastic energy and the variables that influence them –Explain conservation of energy Success Criteria: –Apply equations for kinetic energy, gravitational potential energy, and elastic energy –Recognize that restoring forces are active when objects are deformed –Apply the equation for the force necessary to compress or stretch a string –Conduct simulations of transformations of energy involved in the pole vault. Do Now: –Write LO and SC in notebook –WDYS/WDYT pg 220 Agenda: –Do Now –LO/SC –Investigate

Investigate #1-9 Worksheet from Mattea

November 2, 2010 HW: 2.8 PTG #1, 2, 3, 6, 7, 8, 13, Due Friday Learning Objectives:  Describe kinetic, gravitational potential, and elastic energy and the variables that influence them –Explain conservation of energy Success Criteria: –Apply equations for kinetic energy, gravitational potential energy, and elastic energy –Recognize that restoring forces are active when objects are deformed –Apply the equation for the force necessary to compress or stretch a string –Conduct simulations of transformations of energy involved in the pole vault. Do Now: –Thinking about pole vaulting… What did the ruler represent? The ball? The penny? Agenda: –Do Now –LO/SC –Investigate(Finish) –Physics Talk

2.8 Physics Talk What is happening to speed at each position? 1.Force gives the ball an upward speed 2.Speed decreases as the ball is acted upon by gravity 3.Vertical position is maximum, but vertical speed is 0 4.Ball increases in speed as it is acted upon by gravity 1 4 3 2

2.8 Physics Talk What changed in terms of energy? Total energy is always the same, it is just transformed from one form to another

2.8 Physics Talk What is Kinetic Energy (KE)? What is Gravitational Potential Energy (GPE)? Energy associated with motion The energy an object possesses because of its vertical position from Earth

2.8 Physics Talk What is potential energy (PE)? What is the Law of Conservation of Energy? Energy associated with position (stored) Energy cannot be created or destroyed! It can be transformed from one form to another but the total energy remains constant!

2.8 Physics Talk What changed in terms of energy? 1.Ball has only kinetic energy 2.Kinetic energy decreases, Gravitational Potential Energy increases 3.Kinetic Energy=0, Max GPE 4.GPE decreases, Kinetic Energy increases 1 4 3 2

2.8 Physics Talk What energy is needed to get the ball moving? To get it to stop? What is the equation for Work? WORK! Work is the force applied over a distance Causes the change in forms of energy Work=Force x Distance W=Fd Units=Joules J W dF

Think about launching the penny… Work was done on the ruler to add energy to the system After bending the ruler it had Elastic Potential Energy When you released the ruler it applied a force over a distance to the penny (work) The penny now has Kinetic Energy As it travelled up, the KE became GPE At the peak, the penny had no KE and all GPE As the coin fell GPE became KE Sum of the GPE and KE was always the same (conservation of energy)

November 3, 2010 HW: 2.8 PTG #1, 2, 3, 6, 7, 8, 13, Due Friday Learning Objectives:  Describe kinetic, gravitational potential, and elastic energy and the variables that influence them –Explain conservation of energy Success Criteria: –Apply equations for kinetic energy, gravitational potential energy, and elastic energy –Recognize that restoring forces are active when objects are deformed –Apply the equation for the force necessary to compress or stretch a string –Conduct simulations of transformations of energy involved in the pole vault. Do Now: –Explain what happens to KE and PE as you ride your bike up a hill. Agenda: –Do Now –LO/SC –Vocab Activity

Pole Vaulting!!! http://www.youtube.com/watch?v=kJu citWzywM&feature=fvwhttp://www.youtube.com/watch?v=kJu citWzywM&feature=fvw Food energy provides muscular energy to run which is KE Vaulter’s KE is converted to Elastic PE in the pole As the pole unbends, EPE is transferred to the vaulter as GPE As vaulter falls GPE is transferred to KE Total energy remains the same!

Equations!!! Work Elastic (spring)PE W=Fd F=force (N) d=distance (m) W=work (Joules J) EPE=1/2kx 2 K=spring constant (N/m) x=amount of bend in meters EPE=Joules (J)

Equations!!! Gravitational Potential Energy Kinetic Energy GPE=mgh GPE=Joules (J) m=mass (kg) g=gravity (m/s 2 ) h-=height (m) KE=1/2mv 2 KE=Joules (J) m=mass (kg) v=speed (m/s)

Practice Problems Pg. 226-227 #1-Whole group #2-Whole Group #3-Small Group #4-Individually

Vocab Activity Book DefinitionDefinition in your words 2.8 Vocab Boxes.docx Example or EquationPicture/Drawing

November 4, 2010 HW: 2.8 PTG #1, 2, 3, 6, 7, 8, 13, Due Friday Learning Objectives:  Describe kinetic, gravitational potential, and elastic energy and the variables that influence them –Explain conservation of energy Success Criteria: –Apply equations for kinetic energy, gravitational potential energy, and elastic energy –Recognize that restoring forces are active when objects are deformed –Apply the equation for the force necessary to compress or stretch a string –Conduct simulations of transformations of energy involved in the pole vault. Do Now: –Find the equations for EPE, KE, W, etc. Agenda: –Do Now –LO/SC –Practice Problems

Practice Problems Work and Energy Practice Problems.pdfWork and Energy Practice Problems.pdf

November 5, 2010 HW: None Learning Objectives:  Describe kinetic, gravitational potential, and elastic energy and the variables that influence them –Explain conservation of energy Success Criteria: –Apply equations for kinetic energy, gravitational potential energy, and elastic energy –Recognize that restoring forces are active when objects are deformed –Apply the equation for the force necessary to compress or stretch a string –Conduct simulations of transformations of energy involved in the pole vault. Do Now: –Get out 2.8 HW Agenda: –Do Now –LO/SC –Review HW –Relay!

Relay Energy Relay.pdf Work and Energy Relay.pdf

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