Warm-Up *Turn in Potential Energy Practice

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Warm-Up *Turn in Potential Energy Practice When a 2kg mass is attached to a vertical spring, the spring is stretched 10cm such that the mass is 50 cm above the table. What is the gravitational potential energy associated with this mass relative to the table? What is the spring’s elastic potential energy if the spring constant if 400.0 N/m. What is the total potential energy of this system?

Conservation of Energy

Conserved Quantities As we have already learned, mass is a conserved quantity. (Law of Conservation of Mass) Mass of Light Bulb = Mass of all shattered pieces

Mechanical Energy Mechanical Energy- the sum of kinetic energy and all forms of potential energy (gravitational & elastic). Nonmechanical Energy- all other forms of energy (nuclear, chemical, internal, and electrical, thermal, radiant, acoustic) Negligible or irrelevant for most problems Motion of a Clock Pendulum Highest point of swing- only gravitational PE Other points of swing- KE Elastic PE from springs inside

Conservation of Mechanical Energy In the absence of friction and regardless of the path the object travels, the total mechanical energy remains the same. Initial Mechanical Energy= Final Mechanical Energy Kinetic Energy  Gravitational Potential Energy

Friction Mechanical Energy is not conserved in the presence of friction. When there is kinetic friction, kinetic energy is converted into a nonmechanical form of energy Nonmechanical energy is no longer negligible. Total Energy is ALWAYS conserved, but Mechanical Energy can be “lost”

Practice Starting from rest, a child zooms down a frictionless slide from an initial height of 3.00 m. What is her speed at the bottom of the slide? Assume she has a mass of 25.0 kg.

Warm-Up Create a concept map for energy. Include the following terms: Radiant Thermal Nuclear Gravitational Kinetic Acoustic Mechanical Potential Internal Electrical Nonmechanical Elastic chemical.

Warm-Up A person stands on a diving board 20 m above the water below. Draw a picture of this. Label the following on your picture: The type of energy they have at the top The type of energy when they have 10m above the water. The type of energy the have right as they hit the water. What do these all have in common?

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