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Energy & Conservation

Energy & Conservation. Chapter 11 Section 11.1 & 11.2. Learning Objectives. Distinguish between kinetic and potential energy and calculate by formulas. Recognize the factors affecting kinetic (speed and mass) and gravitational potential (mass, height and gravity)energies.

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Energy & Conservation

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  1. Energy & Conservation Chapter 11 Section 11.1 & 11.2

  2. Learning Objectives • Distinguish between kinetic and potential energy and calculate by formulas. • Recognize the factors affecting kinetic (speed and mass) and gravitational potential (mass, height and gravity)energies. • State the law of conservation of energy • Describe the transformation of energy from one to another (using example free fall)

  3. Section 11.1 Kinetic Energy Kinetic Energy exists whenever an object which has mass is in motion with some velocity. KE = (1/2)mv2 The kinetic energy is proportional to the object’s mass. Units are Joules A 7.26-kg ball kinetic energy more or 0.148-kg baseball with the same velocity….?

  4. Section 11.1 Gravitational Potential Energy • Potential energy exists whenever an object which has mass has a position within a force field. Gravitational Potential EnergyPE = mgh g is the acceleration due to gravity. Gravitational potential energy Units : joules

  5. Phts Simulations

  6. Transformation of K.E & P.E • When a ball is thrown upward.

  7. Transformation of K.E & P.E • When a ball is dropped downward.

  8. Section 11.2 Law of Conservation of Energy • The law of conservation of energy states that in a closed system energy is conserved. (Energy changes from one form to another while the total energy of the system remains constant.

  9. Section Mechanical Energy 11.2 • The sum of the kinetic energy and gravitational potential energy of a system is called mechanical energy. Mechanical Energy ME = KE+PE • The mechanical energy of a system is equal to the sum of the kinetic energy and potential energy if no other forms of energy are present.

  10. Section Conservation of Energy 11.2 • A ball is falling down freely from height of 2m. Find its ME at three points. Click image to view the movie.

  11. Examples of ME conservation Skiing Pendulum

  12. Problem solving question…… Worksheet • Online Quiz ……….. PLATO • Class Activity………… PLAO

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