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PHYS3 > Autmun Topic Test > Flashcards

Autmun Topic Test Flashcards

1
Q

What is a system

A

Group of objects

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2
Q

When a system changes the way the energy is stored

A

Changes

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3
Q

Energy can be transferred usefully, stored or dissipated,

A

Bu cannot be created or destroyed

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4
Q

Work done is measured in

A

J joules

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5
Q

Force is measured in

A

N newtons

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6
Q

Distance os measured in

A

M metres

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7
Q

1 joule =

A

1 newton metre

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8
Q

Work done against a frictional force causes

A

A temp rise of the object

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9
Q

Gravitational potential energy

A

Ep in joules

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10
Q

Mass is measured

A

In kg

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11
Q

Gravitational field strength

A

G is in newtons per kg

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12
Q

Height

A

In metres

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13
Q

Kinetic enrgy

A

Ek in joules

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14
Q

Ways of reducing unwanted energy transfers

A

Double glazed windows to stop thermal enrgy transferring ,lubrication to reduce friction and therefore heat energy transfer

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15
Q

Ways to increase the efficiency of an intended energy transfer

A

Reduce the amount of enrgy transferred to thermal so heat that is unwanted again by lubrication or insulation

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16
Q

1 joule per second is

A

1 watt

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17
Q

Power

A

P in watts W

18
Q

Energy transferred

A

E in joules J

19
Q

Time

A

T in seconds S

20
Q

Work done

A

W in joules

21
Q

Two motors lift the same weight to the same height but one does it quicker

A

Rate if change of energy so in this case the transfer if enrergy is work done to kinetic . So as one is more powerful it makes one rate of change quicker than the other

22
Q

Main enrgy sources on earth

A

fossil fuels (coal, oil and gas), nuclear fuel, bio-fuel, wind, hydroelectricity, geothermal, the tides, the Sun and water waves

23
Q

Renewable energy source

A

One that is being replenished as it is being used

24
Q

Uses of energy resources :

A

Transport, electricity generation,and heating

25
Q

Difference between renewable and non renewable energy sources

A

Non renewable means theres a limited amount of it so a finite resource and renewable means it gets replenished as it gets produced

26
Q

Environmental issues from hydro electricity

A

Damns force many wildlife to relocate and die

27
Q

Environmental issues from nuclear

A

Nuclear leakage and radiation can kill lots of wildlife and mutate them

28
Q

Fossil fuels affect on environment

A

Produce loads of co2 lowering the air quality resulting in animals dying from air pollution

29
Q

Fossil fuels are used for

A

transport, electricity generation and heating

30
Q

Bio fuel

A

transport, electricity generation and heating

31
Q

Nuclear

A

Electricity generation

32
Q

Wind

A

Electricity generation

33
Q

Hydroelectricity

A

Electricity generation

34
Q

Geothermal

A

Electricity generation and heating

35
Q

Tides

A

Electricity generation

36
Q

Sun

A

Electricity generation. Solar panels take up lots of spaces possibly forcing people out of living spaces and animals to make room

37
Q

Water waves

A

Electricity generation

38
Q

Energy patterns and trends the Main energies used

A

Oil, gas and coal all fossil fuels as fossil fuels are simple to turn into enrgy and there are lots of them however they also have a higher power out out than most other energies

39
Q

Lowe used energies in tha pattern

A

Hydroelectricity and nuclear make up 10 percent due to the fact that hydroelectricity has a lower power output and nuclear takes longer and is more complicated to produce enrgy

40
Q

Wats hydroelectricity used for in the trends

A

To fill in gaps in the power grid as its very easy to make very quickly

41
Q

Energy def

A

The potential to do work

PHYS3 (4 decks)

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