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Physics > Energy Stores and Transfers > Flashcards

Energy Stores and Transfers Flashcards

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1
Q

is kinetic energy a store or a transfer of energy?

A

store

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2
Q

is sound energy a store or a transfer of energy?

A

transfer

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3
Q

is chemical energy a store or a transfer of energy?

A

store

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4
Q

is gravitational potential energy a store or a transfer of energy?

A

store

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5
Q

is internal (thermal) energy a store or a transfer of energy?

A

store

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6
Q

is electric energy a store or a transfer of energy?

A

transfer

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7
Q

is light energy a store or a transfer of energy?

A

transfer

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8
Q

is electrostatic energy a store or a transfer of energy?

A

store

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9
Q

is elastic potential energy a store or a transfer of energy?

A

store

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10
Q

is magnetic energy a store or a transfer of energy?

A

store

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11
Q

is heat (radiation) energy a store or a transfer of energy?

A

transfer

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12
Q

is mechanical work (involving forces) energy a store or a transfer of energy?

A

transfer

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13
Q

a wooden block is falling. which of the blocks energy stores is decreasing?

A

gravitational potential

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14
Q

a wooden block is falling. which of the blocks energy stores is increasing?

A

kinetic

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15
Q

where did the energy transfer to when the block landed?

A

the ground, surroundings

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16
Q

In what form is energy stored in your phone?

A

chemical (battery)

17
Q

What energy store is decreasing while the candle or burner is burning?

A

Chemical

18
Q

Where is energy transferred to while the candle or burner is burning?

A

Internal energy of surroundings (thermal)

19
Q

What processes makes a candle or bunsen burner burning energy transfer happen?

A

Heat and light (waves)

20
Q

What energy store increases when you wind up the toy? (Hint: when you wind up the toy, you tighten up a spring inside it.)

A

Elastic potential energy

21
Q

what is the equation for Gravitational Potential Energy

A 
GPE = mgh
g= constant 9.8m/s2
22
Q

Which 2 things affect an object’s KE?

A

The object’s SPEED

The object’s MASS

23
Q

what is the equation for kinetic energy

A

KE=1/2 mv^2
m=mass (kg)
v= velocity (m/s)

24
Q

when compressed or streched a spring gains ……………..

A

potential energy

25
Q

what is elastic potential energy?

A

the energy stored by the
deformation of any elastic object
(eg. The stretching of a rubber band).

26
Q

what is the equation for elastic potential energy

A 
EPE = 1/2kx^2
x= extention
k= constant (N/m)
27
Q

what is power?

A

Power is the rate of energy transfer, measured in Watts (W)

28
Q

what is the equation for power?

A

Power (W) = Energy transferred (J) / Time taken (s)

29
Q

Where does the energy eventually end up?

A

Energy eventually ends up as internal (thermal) energy of

the surroundings

30
Q

As energy is transferred to the surroundings it becomes
less concentrated. What is the word we use in physics for
less concentrated?

A

‘dissipated’

31
Q

The amount of energy wasted by a system indicates how

……………. the system is.

A

The amount of energy wasted by a system indicates how

efficient the system is.

32
Q

what are the equations for efficiency

A

Efficiency = useful energy transferred by the device (J) / total energy supplied to the device(J)

Efficiency = useful power transferred by the device (W)
/ total power supplied to the device(W)

33
Q

No device is ……… efficient and the wasted energy is usually spread out (………..) to the ……… (thermal) of the ………

A

No device is 100% efficient and the wasted energy is usually spread out (dissipated) - internal (thermal) of the surroundings.

34
Q

what does the width of the top arrow represnt in a sankey diagram

A

the efficient energy

35
Q

what does the width of the bottom arrow represent in a sankey diagram

A

the energy wasted

36
Q

what do the top and bottom widths of the sankey diagrams add up to

A

the total energy input

Physics (12 decks)

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