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Chapter 11

Chapter 11. Energy and Its Conservation. Launch Lab. 10 minutes Beginning page in Chapter. 11.1- The Many Forms of Energy. Common Uses of the Word “ENERGY”:. Page 285. QAR Right There The Author and You On Your Own.

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Chapter 11

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  1. Chapter 11 Energy and Its Conservation

  2. Launch Lab • 10 minutes • Beginning page in Chapter

  3. 11.1- The Many Forms of Energy • Common Uses of the Word “ENERGY”:

  4. Page 285 • QAR • Right There • The Author and You • On Your Own

  5. Throwing a Ball- As a result of the force you apply, the ball gains kinetic energy • Catching a Ball- In catching the ball, you exert a force on the ball in the direction opposite to its motion. Therefore you do negative work on it, causing it to stop. It will have no kinetic energy *Kinetic Energy is always positive *Work can be negative

  6. Kinetic Energy • KE=1/2 mv2 • How many times more KE will an object have if it goes from 10 m/s to 20 m/s? • Which object will have more energy? 0.418 kg baseball or 7.26 kg shot put?

  7. Does a top have kinetic energy? _____ • Rotational Kinetic Energy: KE rot= ½ Iω2 • I= object’s moment of inertia • ω=object’s angular velocity

  8. Remember • W=Kef-Kei • W= (1/2 mfvf2) – (1/2 mivi2) • HOMEWORK: #1-3 page 287 due Friday (Tuesday if snow day tomorrow along with other assignment)

  9. Stored Energy • How much work does gravity do on the circles as its height changes? Wg=-mgh: On the way up the displacement is upward, but the force on the circle is downward so work done by gravity is negative Wg=mgh: On the way down, the force and displacement are in the same direction, so the work done by gravity is positive

  10. Gravitational Potential Energy (PE)- energy that is stored in the system as a result of the gravitational force between the object and Earth • Reference level- the height to which the object has risen and PE is equal to zero is compared to this • PE=mgh

  11. Kinetic Energy and Potential Energy of a System Pendulum Simulation

  12. Reference Level • CRISS Strategy: Read And Say Something

  13. HOMEWORK: #4-8 page 291 due Tuesday

  14. Elastic Potential Energy • Elastic Potential Energy: stored energy in things like a rubber ball, rubber band, sling shots, and trampolines

  15. Einstein’s Mass

  16. Einstein’s Mass • Eo= rest energy • Eo=mc2 The rest energy of an object is equal to the object’s mass times the speed of light • According to this formula, stretching a spring or bending a vaulting pole causes the spring or pole to gain mass. The change in mass is too small to be detected.

  17. 11.2- Conservation Energy • If you start with $50 and go back and realize $10 is missing what would you do?

  18. Law of Conservation of Energy • In a closed isolated system, energy can neither be created or destroyed • Rather energy is conserved and can change from one form to another. • Total energy remains constant

  19. Conservation of Mechanical Energy • Mechanical Energy- sum of kinetic energy and gravitation potential energy • E=KE+PE

  20. Group Time • Roller Coasters • Skiing • Pendulums • Loss of Mechanical Energy

  21. Homework: • #15-18 page 297 & #19-21 page 300 Due Thursday

  22. Analyzing Collisions • Momentum- product of the object’s mass (m) and the object’s velocity (v) *P=mv P=momentum m=mass v=velocity VIDEO!!

  23. Concept MapsAnalyzing Collisions page 297-300 • Superelastic/Explosive Collision • Elastic Collision • Inelastic Collision

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