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Physics > P1 - Conservation And Dissipation Of Energy > Flashcards

P1 - Conservation And Dissipation Of Energy Flashcards

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1
Q

Energy can be stored in a Variety of Energy _________.

A

Stores.

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2
Q

What are the Three Ways Energy can be Transferred?

A

Heating, Waves or an Electric Current.

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3
Q

How does Thermal Energy describe Energy?

A

Temperature.

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4
Q

When an Object Falls and Gains ________, its Store of Gravitational ______________ Energy Decreases, and its Kinetic Energy Store ______________.

A

Speed…Potential…Increases…

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5
Q

What cannot be Created or Destroyed?

A

Energy.

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6
Q

What is a System in Physics?

A

An Object or Group of Objects.

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7
Q

Conservation of Energy applies to ALL ________ Changes.

A

Energy.

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8
Q

What is a Closed System?

A

A System in which no Energy Transfers take place.

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9
Q

Work is Done on an Object when a _______ makes the Object move.

A

Force.

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10
Q

Energy Transferred = Work _____

A

Done.

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11
Q

Work Done (__) = Force Applied (__) x Distance Moved Along The Line Of Action Of The Force (__)

A

W…F…s

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12
Q

Work Done to overcome Friction is mainly Transferred to Thermal ________ Stores by Heating.

A

Energy.

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13
Q

The Gravitational _____________ Energy Store of an Object Increases when it moves Up and Decreases when it moves ______.

A

Potential…Down…

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14
Q

The Gravitational Potential Energy of a Store of an Object ____________ when it is Picked Up.

A

Increases.

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15
Q

The Gravitational Field Strength of the Moon is less than on the _______.

A

Earth.

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16
Q

Change In Objects Gravitational Potential Energy Store (__) = Weight (__) x Change In Height (__)

A

J…N…m…

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17
Q

Change In Gravitational Potential Energy Store (__) = Mass (__) x Gravitational Field Strength (__) x Change of Height (__)

A

J…KG…N/KG…m

18
Q

The Energy in the Kinetic _________ Store of a Moving Object depends on its _____ and its Speed.

A

Energy…Mass…

19
Q

Kinetic Energy (__) = 0.5 x Mass (__) x Speed(Squared) (__)

A

J…KG…m/s…

20
Q

Elastic Potential Energy is the Energy _________ in an Elastic Object when Work is ______ on the Object.

A

Stored…Done…

21
Q

Elastic Potential Energy (__) = 0.5 x Spring Constant (__) x Extension(Squared) (__)

A

J…N/m…m…

22
Q

Useful Energy is _________ Transferred to where it is wanted in the way it is wanted.

A

Energy.

23
Q

Wasted Energy is the Energy that is not usefully _____________.

A

Transferred.

24
Q

What does Dissipated mean?

A

Spread Out.

25
Q

As _________ Dissipates, it becomes Less Useful.

A

Energy.

26
Q

Wasted Energy is ______________ naturally to Surroundings, which are Warmer.

A

Transferred.

27
Q

What is Weight Measured in?

A

Newtons (N).

28
Q

What is Energy Measured in?

A

Joules (J).

29
Q

Energy Supplied to a Device is called _______ Energy.

A

Input.

30
Q

Useful Energy Transferred by a Device is called _________ Energy.

A

Output.

31
Q

Input Energy (__) = Useful Output Energy (__) + Energy Wasted (__)

A

J.

32
Q

Efficiency = Useful Output Energy Transferred By The Device (__) / Total Input Energy Supplied To The Device (__)

A

J.

33
Q

No Energy Transfer can be more than _____% Efficient.

A

100.

34
Q

Machines Waste Energy because of the ___________ between their Moving Parts, Air Resistance, Electrical Resistance and Noise.

A

Friction.

35
Q

_______________ and Gas/Oil Supply most of the Energy you use in your Home.

A

Electricity.

36
Q

Electrical Appliances can Transfer _________ in the Form of _________ Energy at the Flick of a Switch.

A

Energy…Useful…

37
Q

The More Powerful an ______________ is, the Faster the Rate at which it Transfers ________.

A

Appliance…Energy…

38
Q

What is Power in Physics?

A

Rate of Energy.

39
Q

Power (__) = Energy Transferred To The Appliance (__) / Time Taken For Energy To Be Transferred (__)

A

W…J…s…

40
Q

Efficiency = Useful Power Out / Total Power In (x____%)

A

100.

41
Q

Power _________ = Total _______ In - Useful Power Out

A

Wasted…Power…

Physics (18 decks)

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