Energy work and power ppt Flashcards Preview

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Flashcards in Energy work and power ppt Deck (34):
1

2 kinds of energy

potential kinetic

2

energy can be expressed in what 3 ways?

mechanical work

heat

chemical

3

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

SI

4

KE =

kinetic energy (just to know his abreviations)

5

what is energy of motion masured as?

kinetic energy

6

what is the formula for kinetic energy?

KE= 1/2 mv2

m=mass

v= velocity

7

greater mass or speed equals what?

greater kinetic energy

8

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

4

9

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

Mass

ex: electrons, protons, meutrons)

10

_________ is mass times gravity

?= m x g

weight

w= m x g

11

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???

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

basically remember Mass DOES NOT equal weight!!!

12

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

mass or velocity?

velocity

13

what is kinetic energy

movement

14

what is potential energy?

the potential for movement

15

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

KE

16

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

when i drop it what type of energy is it?

potential

kinetic

17

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

potential energy

(PE)

18

formula for PE

PE= mgh

m= mass

g= gravity

h= change in height

19

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

yes!

KE- is part of the internal energy

PE- is the attractive forces associated with PE

A image thumb
20

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)

ATP

21

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

 

  1. KE
  2. PE
  3. PE

22

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what is the basic unit of energy?

Joule

23

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what is a joule?

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

1 meter in the direction of that force!!

24

what is the expenditure of energy?

work

25

definition of work

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

formula for work

W= F x D

W= work

F= force

D= distance

27

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

no, b/c there is no distance

28

what units of SI does work use

joules

(might see ergs)

29

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?

0

no movemnet no work

30

what is power?

the rate os working or the rate of expending energy

31

what is power measured in?

watts

32

what is a watt

1 joule per second

33

energy may take many forms what are 5 forms

PE

KE

mechanical

chemical

heat

34

formula for watts

W = Js-1