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Physics 1 - Motion, Forces And Conservation Of Energy > Energy Conservation > Flashcards

Flashcards in Energy Conservation Deck (15)
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1

what does the law of conservation of energy state

energy cannot be created or destroyed only transferred

2

example of energy conservation

burning wood uses chemical energy in the wood to release thermal energy

3

list the 8 types of energy stores you need to know

kinetic
thermal
electrostatic
chemical
elastic potential
gravitational potential
magnetic
nuclear

4

how is energy transferred

mechanically

5

what does the term "system" refer to

a single object or a group of objects

6

what happens when a system changes

energy is transferred

7

how can energy be transferred when a system changes

it can be transferred into or away from the system, between different objects in the system or between different types of energy stores

8

what is a closed system

a system where neither matter or energy can enter or leave

9

what is the net change in the total energy of a closed system

0

10

explain the transfer of energy in a boiling kettle of water

energy is transferred into the water from the kettle's heating element by heating, into the water's thermal energy store. this causes the the temperature of the water to rise

11

explain the change of stores when water is boiled by a kettle

energy is transferred electrically to the thermal energy store of the kettle's heating element, which transfers energy by heating to the water's thermal energy store

12

what is another way of saying energy transferred

work done

13

what are the 2 ways work can be done

when a current flows or by a force moving an object

14

explain the work done or energy transfer of someone throwing a ball in the air

the initial force exerted by the person to throw the ball does work. it causes an energy transfer from the chemical energy store of the persons arm to the kinetic energy store of the ball and arm

15

explain the work done or energy transfer of a ball being dropped

a ball dropped from a height is accelerated by gravity. the gravitational force does work. it causes energy to be transferred from the ball's gravitational potential energy store to its kinetic energy store