Conservation of Energy

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Presentation transcript:

Conservation of Energy Energy and Motion Table of Contents 8.2 Conservation of Energy

Ch. 8.2 Vocabulary Mechanical Energy: Kinetic or potential energy associated with the motion or position of an object. Energy Transformation: A change from one form of energy to another; also called an energy conversion. Law of Conservation of Energy: The rule that energy cannot be created or destroyed. Thermal Energy: The total kinetic and potential energy of all the particles of an object.

Energy Transformation Interactive Activity Interactive Art Pearson

How Can You Find an Object’s Mechanical Energy? Pg. 296 What do a falling basketball, a moving car, and a trophy on a shelf have in common? They ALL have mechanical energy!! What is MECHANICAL ENERGY?? Is the form of energy related with the motion, position, or shape of an object. Energy related with motion+ position+ shape= Mechanical energy

Calculating Mechanical Energy pg. 297 An object’s mechanical energy is a combination of its potential energy and its kinetic energy. How do you find an object’s mechanical energy ?? You can find an object’s mechanical energy by adding the object’s kinetic energy and potential energy. (Mechanical Energy=Potential Energy + Kinetic Energy) ME= PE+ KE PE= 15 J KE= + 6 J ME= An object with mechanical energy can do work on another object. The more mechanical energy an object has, the more work it can do.

Energy Transformations pg. 298 Energy Transformation: A change from one form of energy to another. One of the most common changes of energy is the one between P__________ and K___________ e__________. r. 298 (all) Transformations between kinetic and potential energy can also occur in any object that rises or falls.

Energy Transformation Interactive Activity Interactive Art Pearson Apply It!!

What is The Law of Conservation of Energy? Pg. 300 The law of conservation of energy states that when one form of energy is transformed to another, no energy is lost in the process. According to the law of conservation of energy, energy cannot be created or destroyed. The total amount of energy is the same before and after any transformation.

Conservation of Energy pg. 298 Figure 3 Pendulum A continuous transformation between potential and kinetic energy occurs in a pendulum. Label the type of the pendulum has at positions A, B, and C?

What is The Law of Conservation of Energy? Pg. 300 Whenever a moving object experiences friction, some of its kinetic energy is transformed into thermal energy. Thermal energy is the total kinetic and potential energy of the particles in an object. It is also sometimes known as heat energy, because when the particles in an object move rapidly, you can feel it as heat.

Conservation of Energy Figure 4 pg. 300/1 Conserving Energy While You Ride 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?