Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

physics > energy > Flashcards

energy Flashcards

You may prefer our related Brainscape-certified flashcards:
Physics 101 flashcards AP® Physics flashcards
1
Q

Name 4 energy stores

A 
thermal
kinetic
gravitational potential
elastic potential 
chemical
magnetic
electrostatic 
nuclear
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

what is a system

A

a single object or group of objects that you are interested in

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

when a system changed

A

energy is transferred

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

what is work done

A

energy transferred

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

describe the energy transfer when wind hits a windmill

A

the energy transfers from the gravitational potential energy store of the wind to the kinetic energy store of the windmill

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what is the equation for kinetic energy

A

ek=1/2mv^2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

what is the equation for gravitational potential energy

A

ep=mgh

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

when something falls

A

energy from its gravitational energy store is transferred to its kinetic energy store

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

what is the equation for elastic potential energy

A

ew=1/2ke^2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

more energy needs to be transferred to the … energy store of some materials to … their temperature

A

thermal energy store, increase

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

what is the equation for specific heat capacity

A

/\E=mc/\ø (mass x specific heat capacity x temperature change

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

energy can never be … nor …

A

created , destroyed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

dissipated energy can also be called

A

wasted energy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

lubrication reduces

A

frictional forces

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

heating can occur by two methods, these are:

A

convection and conduction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

an equation linking power,energy transferred and time is:

A

p=e/t

17
Q

an equation linking: power, work done and time is:

A

p=w/t

18
Q

insulation reduces the rate of what transfer and how?

A

energy transfer
and
heating

19
Q

useful devices are useful because

A

they can transfer energy from one store to another

20
Q

the equation linking useful energy transfer, efficiency and total input energy transfer is

A

efficiency= useful output energy/total input energy

21
Q

electric heaters are usually …% effective

A

100

22
Q

name some non renewable recourses

A

coal
oil
natural gas

23
Q

name renewable energy stores

A 
the sun 
wind
waves
hydroelectricity 
bio-fuel
tides
geothermal
24
Q

non renewable recourses are…

A

reliable

25
Q

one disadvantage of non renewable recourses

A

releases harmful gases weakening the o zone

physics (3 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions