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Chem / Physics II > Energy work and power ppt > Flashcards

Energy work and power ppt Flashcards

Josh's guide to beating shores

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1
Q

2 kinds of energy

A

potential kinetic

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2
Q

energy can be expressed in what 3 ways?

A

mechanical work

heat

chemical

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3
Q

what is the common units of energy? (don’t over think)

A

SI

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4
Q

KE =

A

kinetic energy (just to know his abreviations)

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5
Q

what is energy of motion masured as?

A

kinetic energy

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6
Q

what is the formula for kinetic energy?

A

KE= 1/2 mv2

m=mass

v= velocity

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7
Q

greater mass or speed equals what?

A

greater kinetic energy

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8
Q

when measuring KE, if you double the speed you will have ____ times more KE

A

4

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9
Q

______ is the amt of material or matter contained in an object. give examples

A

Mass

ex: electrons, protons, meutrons)

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10
Q

_________ is mass times gravity

?= m x g

A

weight

w= m x g

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11
Q

going off the last 2 slides definitions that, mass is the amt of material contained in an object (elcectrons, protons, neutrons), and weight is mass times gravity.

how is this applied if you put mass into space???

A

you have the same mass in space but a much lighter weight ( much less gravitational pull)

basically remember Mass DOES NOT equal weight!!!

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12
Q

**********************************

in the equation for KE which has more of an influance on KE

mass or velocity?

A

velocity

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13
Q

what is kinetic energy

A

movement

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14
Q

what is potential energy?

A

the potential for movement

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15
Q

everything around us has KE, so the more movement the more what?

A

KE

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16
Q

a pen held in my hand stil is what type of energy?

when i drop it what type of energy is it?

A

potential

kinetic

17
Q

what is the energy available or waiting to be converted into power?

A

potential energy

(PE)

18
Q

formula for PE

A

PE= mgh

m= mass

g= gravity

h= change in height

19
Q

does a glass of water sitting on a table have any energy?

A

yes!

KE- is part of the internal energy

PE- is the attractive forces associated with PE

20
Q

what is a form of potential energy in our bodies???

(this his his example from his lecture, not just my random choice, if you disagree and say there are many go listen to his podcast the try again)

A

ATP

21
Q

application of KE and PE

Indpiration requires ________energy.

first the _______ energy in chmical ATP is converted to mechanical work, during this process heat will be generated and lost from the system

at teh end of inspiration the elevated rib cage and elastic properties of the lungs have stored ______ energy and drive passive expiration

A
  1. KE
  2. PE
  3. PE
22
Q

*****************

what is the basic unit of energy?

A

Joule

23
Q

**************************

what is a joule?

A

the force of one newton that moves it’s point of application

1 meter in the direction of that force!!

24
Q

what is the expenditure of energy?

A

work

25
Q

definition of work

A

application where force is applied to produce movement in the direction of that force

simple terms= force exerted over a distance

or force acting through distance

26
Q

formula for work

A

W= F x D

W= work

F= force

D= distance

27
Q

if someone is sitting at a desk are the doing the act of work?

A

no, b/c there is no distance

28
Q

what units of SI does work use

A

joules

(might see ergs)

29
Q

how much work is done pushing on a 100 kg pt on a 75kg operating table and you can’t get teh damn thing to move?

A

0

no movemnet no work

30
Q

what is power?

A

the rate os working or the rate of expending energy

31
Q

what is power measured in?

A

watts

32
Q

what is a watt

A

1 joule per second

33
Q

energy may take many forms what are 5 forms

A

PE

KE

mechanical

chemical

heat

34
Q

formula for watts

A

W = Js-1

Chem / Physics II (20 decks)

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