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Understanding Energy Forms and Conservation: Kinetic, Potential, and Beyond

Dive into the fascinating world of energy in Chapter 11, where we explore the various forms of energy, including kinetic and potential energy. Discover how energy is transferred and transformed through everyday actions—like throwing and catching a ball. Learn about gravitational and elastic potential energy, and the principle of conservation of energy, which states that energy cannot be created or destroyed, just transformed. Engage with simulations and real-life examples from roller coasters to pendulums, and enhance your understanding of momentum through collisions.

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Understanding Energy Forms and Conservation: Kinetic, Potential, and Beyond

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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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