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Chapter 4 Energy

chapter 4 energy notes

QuestionAnswer
What is energy? abilty to cause change
What is potential energy? stored energy due to position
What is kinetic energy? energy a moving object has because of its motion
What is elastic potential energy? stored energy by something that can strech or compress
What is chemical potential energy? energy stored in chemical bonds
What is gravitational potential energy? stored energy by objects due to their postion above earths surface GPE= mgh (m= mass; g=acceleration of gravity always 9.8 on earth; h= height)
What is mechanical energy? total amount to kinetic and potential energy ME= GPE + KE
What is the law of conservation of energy? energy can not be created or destroyed
What is the formula for kinetic energy? KE= 1/2 mv² (m= mass;v= speed)(answer is in J or joules)
What are the different forms of energy? (and examples) electrical: electrical appliances chemical: food,batteries, gasoline thermal: heat radiant/electromagnetic: sun, light, killer microwaves,doesn't need a medium mechanical: moving something sound: vibration in a medium nuclear: fission and fusion
What are the energy transformations of jumping on a trampoline? potential to kinetic
What are the energy transformations of ringing to doorbell? mechanical to electrical to sound
What are the energy transformations of eating food then walking? chemical to kinetic
What are the energy transformations of batteries powering a flashlight? chemical to electrical to electromagnetic
What is nuclear fission? atom nucleus splits
What is nuclear fusion? atom nucleus combine
Created by: studyshamyra
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