Law of Conservation of Energy

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Presentation transcript:

Law of Conservation of Energy states that energy can be neither created nor destroyed the total amount of energy in a closed system is the same energy can be changed from one form to another, but all of the different forms of energy add up to the same total amount of energy PE = 24 J KE = 0 J PE = KE = 12 J 12 J A seagull steals a sandwich and drops it from a height of 7 m before eating it. What would be the sandwich’s approximate PE and KE as it falls to the ground if air resistance is negligible? PE = KE = 0 J 24 J

Forms of Energy

has more thermal energy? Why? results from the movement (kinetic energy) of particles in matter when particles move faster they have more thermal energy than when they move slower particles of a substance that are farther apart have more thermal energy than if they were closer together depends on the number of particles in a substance Which box of particles has more thermal energy? Why?

Chemical Energy type of potential energy stored in the chemical composition of matter depends on the types and arrangement of atoms in a substance Example: A bond between a hydrogen atom and an oxygen (H-O) atom will release more energy than one between two carbon atoms (C-C) C H O HO OH ≈464,000 J ≈347,000 J Glucose What are some examples of chemical energy?

Nuclear Energy found in the nucleus of an atom is released when an atom’s nucleus breaks apart (fission) or when the nuclei of two atoms come together (fusion) Example: Nuclear fission takes place in a nuclear power plant while nuclear fusion takes place in the Sun. + + Is nuclear fission or nuclear fusion taking place? Explain your reasoning. Deuterium Tritium + helium neutron

Electromagnetic Energy transmitted through space in the form of electromagnetic waves light, electricity, and magnetism are representative of electromagnetic energy can travel through empty space Image taken from: http://zebu.uoregon.edu/~imamura/122/lecture-2/em.html

Identify the Form of Energy Thermal (burner increases movement of H2O molecules) Chemical (food) Electromagnetic (radio waves) Electromagnetic (electricity)