8.2 Conservation of Energy

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Presentation transcript:

8.2 Conservation of Energy How can you find an object’s mechanical energy? What is the Law of Conservation of Energy?

Energy associated with the motion, position, &/or shape of an object Mechanical Energy Energy associated with the motion, position, &/or shape of an object

The ball’s mechanical energy TRUE True or False? The ball’s mechanical energy does not change from Point A to Point B.

The ball’s Mechanical Energy does not change, BUT… 22 J The ball’s Mechanical Energy does not change, BUT… the amount of Potential Energy & Kinetic Energy changes. 22 J Why does the ball’s gravitational PE increase from points A to B? The ball gets higher!

How can you tell that the ball’s kinetic energy is increasing? The ball is covering more distance in equal time intervals, so its speed must be increasing.

Energy Transformation C. A change of energy from one form to another. Evaluate the pendulum and ENERGY TRANSFORMATION at positions A,B & C (p. 298) B.

Elastic Potential energy Kinetic energy Gravitational Potential energy Kinetic energy From his running.

motion position shape Its kinetic energy is zero because mechanical energy equals potential energy plus kinetic energy. 5.2 J + 3.5 J = 8.7 J adding together the object’s kinetic energy and potential energy.

Law of Conservation of energy Energy cannot be created or destroyed, only transferred

Conserving Energy While You Ride (p.300): Transformations between potential and kinetic energy occur during a roller coaster ride. How much potential and kinetic energy does the coaster have at each point?

Thermal Energy (or Heat Energy) The total kinetic & potential energy of the PARTICLES that make an object

Whenever a moving object experiences friction, some of its kinetic energy is transformed into thermal energy

The total amount of energy before a transformation is the same as after a transformation. cannot be created or destroyed.

Create friction & thermal energy 1. Put your hands together. 2. Vigorously rub, & feel the burn Friction causes some mechanical energy (ME) to be converted to thermal energy (TE). http://www.youtube.com/watch?v=0fTD0mUT5qE&feature=player_embedded