עמוד:23

Activity Experimentation Energy Changes Experiment A – Rubbing a wooden board with sand paper Objective : To observe the changes in the types of energy as well as the transfer of energy from place to place . Equipment : A flat wooden board and sand paper . Procedure : 1 . Touch the board and feel its temperature . 2 . Rub the board rapidly with the sand paper . 3 . Touch the wooden board . Caution : take care to touch it for just an instant . What do you feel now ? Results : Describe what has occurred in terms of energy in both in words and using an energy diagram . Experiment B – Operation of a solar fan Objective : To observe the change of energy in the solar fan . Equipment : A fan connected to a solar cell . Procedure : Illuminate the solar cell either by shining a bright lamp on it or by exposing it to sunlight . Result : Describe the energy transfers in both words and using an energy diagram . Summary : Think of another way of operating the fan and describe it .

מטח : המרכז לטכנולוגיה חינוכית


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