Chapter 13 Lesson 2 Energy Transformation Ms. Amanda and Ms. Diana

Changes Between Forms of Energy Energy can change from one form to another depending on the work that is being done. Example: Using a Microwave

Changes Between Kinetic and Potential Energy Energy transformations also take place when you are throwing a ball up in the air. Kinetic Energy to Potential The ball has the most kinetic energy when it leaves your hand. As the ball continues upward, the speed and kinetic energy decrease. At the highest point, the ball has potential energy.

Changes Between Kinetic and Potential Energy Potential Energy to Kinetic Energy As the ball moves downward, its potential energy decreases but its speed increases. The ball’s kinetic energy also increases.

The Law of Conservation of Energy Law of Conservation of Energy – energy can be transformed from one form into another or transferred from one region to another, but energy cannot be created or destroyed.

Friction and The Law of Conservation of Energy Friction – a force that resists the sliding of two surfaces that are touching. When you are riding a bike and then stop, the mechanical energy is transformed to thermal energy because of friction.

Using Energy Every day you use different forms of energy to do different things. Using Thermal Energy: All forms of energy can be transformed to thermal energy. We use thermal energy to cook food and heat our homes Using Chemical Energy: We use chemical energy from food to do our daily activities. Plants use light energy to make chemical energy. Using Radiant Energy: We use radiant energy when we use cell phones because it sends signals. The radiant energy transforms to sound energy and electric energy.

Using Energy Continued….. Using Electric Energy: Many of the devices we use need electric energy. (cell phones, MP3 players, hair dryers, handheld video games, etc.) Waste Energy When energy is being transformed from one form to another, some of the energy is released into the air. Waste Energy – thermal energy that cannot be used.

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