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physics > ch5 - work, energy and power > Flashcards

ch5 - work, energy and power Flashcards

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1
Q

‘doing work’

A

way of transferring energy from on object to another

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2
Q

‘doing work’

A

way of transferring energy from on object to another

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3
Q

doing work ON something =

A

transferring energy TO the thing

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4
Q

what is energy?

A

a calculated quantity that is conserved during any change, that which is transferred when a force does work

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5
Q

more work done =

A

. more force
. more distance

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6
Q

what is work done?

A

when a force displaces the body in the direction of the force, energy is transferred

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7
Q

work done formula

A

force * distance in the direction if the force

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8
Q

work done = energy transferred

A
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9
Q

work done component formula?

A

w = Fs cos O

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10
Q

what is gravitational potential energy?

A

the energy a body has due ti its position in a gravitational field

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11
Q

gpe formula

A

gpe = mgh

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12
Q

gpe = mgh derivation

A

energy transferred = work done
gpe = F * s
gpe = weight * h
gpe = mg * h
gpe = mgh

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13
Q

potential energy?

A

energy of an object because of its position or shape

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14
Q

forms of potential energy?

A

. gravitational - object in gravitational field
. electric - electrically charged of bject in an electrical field
. elastic - of a squashed, twisted, stretched objsct goes back to its original position

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15
Q

kinetic energy formula?

A

0.5mv²

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16
Q

ke formula derivation?

A

v² = 2as + 0

times both sides by 0.5m

0.5mv² = mas
0.5mv² = Fs
energy transferred = work done

17
Q

more ke

A

more speed of motion of force

18
Q

gpe and ke on a hill?

A
  1. top of hill, max gpe
  2. going downhill, gpe to ke
  3. bottom of hill, all gpe to ke, sound, heat
  4. going uphill, ke to gpe
19
Q

percentage efficiency?

A

useful output / total input * 100%

20
Q

sankey diagram

A

to show energy transfers

21
Q

principle of conservation of energy

A

energy cannot be created or destroyed - only changed from one form to another

22
Q

total energy before = total energy aft r

A
23
Q

power?

A

rate at with the device does work per unit time

24
Q

power formula

A

P = W/t
P = Fv

25
Q

watt

A

one joule per second, unit of power

26
Q

P = force * velocity derivation

A

work done = F * dist
W = F * v * t

P = W/t
P = Fvt/ t
P = Fv

27
Q

average human power

A

116W

physics (15 decks)

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