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Physics > Energy - PART 1 (P1) > Flashcards

Energy - PART 1 (P1) Flashcards

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1
Q

what is kinetic energy

A

energy stored by a moving object

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2
Q

what is elastic potential energy

A

energy stored in a stretched spring, elastic band

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3
Q

what is gravitational potential energy

A

energy gained by an object raised above the ground

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4
Q

what is a system

A

an object or group of objects that interact together e.g kettle boiling water

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5
Q

what are energy stores

A

kinetic, chemical, thermal, gravitational potential energy, elastic potential, magnetic, electrostatic, nuclear

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6
Q

ways to transfer energy from one store of energy to another

A

light, sound, electricity, thermal, kinetic

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7
Q

unit

A

Joules(J)

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8
Q

what is work

A
  • doing work transfers energy from one store to another

- by applying a force to an object the energy store is changed

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9
Q

what is power

A

the rate of energy transfer

1 Joule of energy per second = 1 watt of power

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10
Q

what is the unit for specific heat capacity

A

J/KG*C

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11
Q

what is the unit for temp change

A

*C

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12
Q

what is the unit for work done

A

J

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13
Q

what is the unit for force

A

N

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14
Q

what is the unit for distance moved

A

metres

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15
Q

what is the unit for power

A

Watts

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16
Q

what is the unit for time

A

seconds

17
Q

what is specific heat capacity

A

energy needed to raise 1Kg of substance by 1*C

18
Q

mechanical

A

force acts upon an object

19
Q

electrical

A

electric current flow

20
Q

heat

A

temp difference between objects

21
Q

radiation

A

electromagnetic waves or sound

22
Q

what happens in a closed system

A

no change in total energy system

23
Q

what happens in an open system

A

energy can dissipate

24
Q

what is useful energy

A

energy transferred and used

25
Q

what is wasted energy

A

dissipated energy stored less usefully

26
Q

what is efficiency

A

how much energy is usefully transferred

27
Q

what does it mean by dissipate

A

to scatter in all directions or to use wastefully

when energy is wasted it dissipates into the surroundings as thermal energy

28
Q

ways to reduce wasted energy

A

insulation
streamline design
lubrication of moving parts

29
Q

principle of conservation of energy

A

energy cannot be created or destroyed

30
Q

unit for energy

A

J

31
Q

unit for velocity

A

m/s

32
Q

unit for spring constant

A

N/m

33
Q

unit for extension

A

m

34
Q

unit for mass

A

Kg

35
Q

unit for gravitational field strength

A

N/Kg

36
Q

Height

A

m

Physics (7 decks)

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