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Physics > energy (paper 1) > Flashcards

energy (paper 1) Flashcards

1
Q

is energy ever used up?

A

no

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2
Q

list the 8 energy stores

A

thermal
kinetic
GPE
EP
chemical
magnetic
electrostatic
nuclear

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3
Q

kinetic energy equation

A

Ek = 0.5mv^2

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4
Q

define doing work

A

transferring energy from one form to another

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5
Q

a builder pushes a wheel barrow a distance of 5.0m across flat ground with a force of 50N. how much work was done by the builder

A

Wd=Fxd
Wd=50N x 5.0N
Wd=250J

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6
Q

what is the gravitational field strength?

A

9.8N/kg

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7
Q

define kinetic energy

A

the energy an object has when its moving at a constant velocity

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8
Q

define renewable

A

resource that won’t run out in our lifetime

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9
Q

define conduction

A

where vibrating particles transfer energy to neighbouring particles

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10
Q

define convection

A

where energetic particles move away from hotter to cooler regions

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11
Q

define non-renewable

A

resource that damages the environment and will run out one day

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12
Q

list the three main non-renewable fossil fuels

A

coal
oil
(natural) gas

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13
Q

list the 7 renewable energy sources

A

sun (solar)
wind
water waves
hydro-electricity
bio-fuel
tides
geothermal

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14
Q

explain how energy is transferred as a ball falls to the ground

A

GPE to kinetic

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15
Q

if energy is transferred to an object’s kinetic energy store what happens to its speed?

A

speed increases

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16
Q

what kind of energy store is energy transferred to when you compress a spring

A

EPE

17
Q

definition of the specific heat capacity of a material

A

the energy required to raise one kg of the material by one degree Celsius (°C)

18
Q

does a high thermal conductivity mean there is a high rate of energy transfer

A

yes

19
Q

give 4 ways to prevent unwanted energy transfers in a home

A

windows and doors
floor insulation
insulating pipes
solid wall insulation

20
Q

define the term system

A

an object or a group of objects

21
Q

a cyclist allows his bike to roll down a hill without pedalling. he applies his breaks towards the bottom making it come to a stop. applying breaks causes brakes to warm up. describe the energy transfers that have occurred and state the forces doing work that cause each of these energy transfers

A
  • gravitational force does work on bike causing energy to be transferred from the GPE store of the bike to its KE store
  • friction force does work between brake pads and wheels causing energy transfer from bikes KE store to thermal store of the brake pads
22
Q

state 2 disadvantages of solar panels

A

efficiency is low
only produces power in the day

23
Q

state the law of conservation of energy

A
  • energy cannot be created or destroyed
  • only can be transferred from one form to another
24
Q

As the parachutist falls, gravitational potential energy and the kinetic store of the parachutist decrease. Energy is still conserved. Explain how energy is still conserved.

A
  • as parachutist falls there is friction between the air and the parachutist and the parachute
  • energy is transferred to the thermal energy store of the parachute and parachutist
25
Q

an archer pulls the string of the bow back. State the name of the energy store that increases as the string is pulled back.

A

elastic

26
Q

A cyclist is cycling along a horizontal road at constant speed. State the name of the energy store of the cyclist that is decreasing as they cycle.

A

chemical

27
Q

Cars are not 100% efficient. Name a wasted energy store for a car?

A

thermal

28
Q

State one advantage and one disadvantage of using a solar farm to produce electricity.

A
  • solar is renewable
  • does not produce electricity at night
29
Q

State two advantages of moving away from using coal as an energy resource.

A
  • contributes to pollution
  • non-renewable energy resource and will run out

Physics (9 decks)

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