science Flashcards
How is the temperature different from heat?
Heat transfers cause temperature to change
what is conduction?
the transfer of enegy from one thing to another throught contact
what is radiation?
the transfer of enegy woithout contact
what is convection?
Heat transfer caused by the rising of hotter, less dense fluids and the falling of cooler, more
What happens as material heats, expands, and becomes less dense?
it rises
What happens as material cools, contracts, and becomes more dense?
it sinks
what is energy of motion?
kinetic energy
what is a convection current?
Heat transfer caused by the rising of hotter, less dense fluids and the falling of cooler, more dense fluids.
what is a conductor?
a substance that readily transfers heat or electrical energy
What is an insulator?
a material that does not conduct heat or electrical current
What is chemical energy?
A form of potential energy stored in chemical bonds and released through chemical reactions
What is mechanical energy?
the sum of the potential and kinetic energy of an object
What direction does thermal energy flow?
Thermal energy always moves from substances of higher temperature to substances of lower temperatures.
What causes chemical energy?
When there’s a chemical reaction between the molecules of chemical compounds, a new substance may form, and energy may be released
Why is lithium’s so powerful
It’s the lightest of all metals, has the best electrochemical potential and is the largest energy density for weight.
why do balls bouce higher when they are higher
cause the higher the more potential energy which equals more kinetic energy with equals more bounce bounce
What’s an endothermic reaction?
An endothermic reaction absorbs energy from its sounding causing things to cool down.
what are the advantages of lithium-ion batteries?
They provide high levels of charge than other battery technologies, and they have a higher voltage,
what are the disadvantages of lithium-ion batteries?
It is fragile, expensive, and
whats heat
the flow of themrsl energy to a coolor froma warmer object
whats the themral enegy
the average sum og kinitic and poninel energy in a system
whats an exothermic reaction
energy being transfered to it surrounfidnffg
what are forms of head transfer
radation, conduction and convection
whats mechinalucal energy
the sum of potintial and kinitic energy
radation example
statci gettoing sunburnt
whats heta
the flow of thermal energy
physocs of a tpaster
toasters use radation because they toast bread using no contct to the heating beams
potatoe air preasure chips
as the plane got higher the density decreased which increaed the density of the bag of chips
sea panda traits
sea pandas are actaully stronger than sharks
convecetion current example
if you skeep on bunk bed the botton of bunk will be coldet than top bevause of convection currents
puddles n pond
if you pur hot water in a small pond it will beomce hot but if you pour hot water in a large pond it won becomes hot because theres space for the flow of heat to go toto
chemicla energy disvantges
the burning of fosil fuels can cause the pollutuio n to our planet
chemical energy advantges
its abdunt in nature and helpburn things to create energy
