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THERMAL ENERGY & HEAT

Energy & Transformations. THERMAL ENERGY & HEAT. Heat vs. Temperature. Thermal Energy: The total kinetic and potential energy of molecules of a substance. Heat: A measure of the energy transferred from a warm body to a cooler one.

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THERMAL ENERGY & HEAT

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  1. Energy & Transformations THERMAL ENERGY & HEAT

  2. Heat vs. Temperature • Thermal Energy: The total kinetic and potential energy of molecules of a substance. • Heat: A measure of the energy transferred from a warm body to a cooler one. • Temperature: A measure of the average kinetic energy of the atoms or molecules of a substance. • Heat transfers naturally from an area of high temperature to low temperature. • Higher temperature = higher thermal energy

  3. Example 1 • A 850C 250 mL cup of water is poured into 2L of milk at 250C • Compare the kinetic energies of the molecules of each substance. • Compare the thermal energies of both substance. • When would heat stop transferring from the water into the milk?

  4. Methods of Heat Transfer • Conduction: The transfer of heat by direct contact. • Convection: The transfer of heat through a fluid. • Radiation: The transfer of heat by means of electromagnetic waves (EM).

  5. Example #2 • Determine the type of heat transfer in each situation. In which direction does heat transfer? • An ice pack is placed on a twisted ankle. • A whole turkey is cooked inside of an oven for dinner. • A microwave oven cooks a delicious microwave lunch.

  6. Example #3 • A ball is dropped vertically from a height of 3m. It rebounds to a height of 2m. • Draw the energy transformation equation when it hits the ground and when it has rebounded to the max height. • Does this violate the law of conservation of energy?

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