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Chapter 2, Section 8

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

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Chapter 2, Section 8

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

  2. November 1, 2010HW: 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

  3. Investigate #1-9 • Worksheet from Mattea

  4. November 2, 2010HW: 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

  5. 2.8 Physics Talk • What is happening to speed at each position? • Force gives the ball an upward speed • Speed decreases as the ball is acted upon by gravity • Vertical position is maximum, but vertical speed is 0 • Ball increases in speed as it is acted upon by gravity 3 2 4 1

  6. 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

  7. 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

  8. 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!

  9. 2.8 Physics Talk • What changed in terms of energy? • Ball has only kinetic energy • Kinetic energy decreases, Gravitational Potential Energy increases • Kinetic Energy=0, Max GPE • GPE decreases, Kinetic Energy increases 3 2 4 1

  10. 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 F d

  11. 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)

  12. November 3, 2010HW: 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

  13. Pole Vaulting!!! • http://www.youtube.com/watch?v=kJucitWzywM&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!

  14. Equations!!! • Work • Elastic (spring)PE • W=Fd F=force (N) d=distance (m) W=work (Joules J) • EPE=1/2kx2 K=spring constant (N/m) x=amount of bend in meters EPE=Joules (J)

  15. Equations!!! • Gravitational Potential Energy • Kinetic Energy • GPE=mgh GPE=Joules (J) m=mass (kg) g=gravity (m/s2) h-=height (m) • KE=1/2mv2 KE=Joules (J) m=mass (kg) v=speed (m/s)

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

  17. Vocab Activity

  18. November 4, 2010HW: 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

  19. Practice Problems • Work and Energy Practice Problems.pdf

  20. November 5, 2010HW: 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!

  21. Relay • Energy Relay.pdf • Work and Energy Relay.pdf

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