עמוד:14

Transformations Energy Transfers and Energy Wind creates waves in the sea . Energy is transferred from the wind to the seawater . This transfer enables the formation of waves in the sea . In a solar water heater , energy is transferred from the Sun to the water heater ; its type changes as well — from radiation energy to heat — which enables the heating of water in the water heater . When air conditioning is used to heat a home , the energy is conducted from the power plant through the electrical socket to the air conditioner , where it is turned into heat . It is by means of energy that natural processes take place , as well as processes required for the operation of devices and appliances . In these processes , energy either changes from one type to another , or it is transferred from place to place . Energy Transformations Energy can be transformed from one type to another . For example , in the case of a ball rolling down a slope , part of its potential energy turns into kinetic energy . This kind of change in the type of energy is called energy transformation . In the following experiments and simulations , you will investigate various phenomena that involve energy transformations , in other words , situations in which energy is transformed from one type to another . Activity Experimentation Energy Transformations Experiment A : A marble on an inclined plane Objective : To observe and analyze the transformation of potential energy into kinetic energy . Equipment : Inclined plane , marble . Procedure : Place a marble at the top of the inclined plane . Let the marble roll down . Results : Describe the changes in the marble’s movement . Explanation : In this process , a transformation of energy took place in the same body , the marble . The marble’s potential height was converted into kinetic energy . This energy transformation may also be described using an energy transformation flow diagram : The marble’s kinetic energy Transforms into The marble’s potential energy

מטח : המרכז לטכנולוגיה חינוכית


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