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Science > Physics keywords > Flashcards

Physics keywords Flashcards

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1
Q

P1.4 Density =

A

mass / volume

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2
Q

P1.5 (resultant) Force =

A

mass x acceleration

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3
Q

P1.5 Hooke’s law

A

F = kx (k is spring constant)

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4
Q

P1.5 friction

A

force between two surfaces which impedes motion and results in heating

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5
Q

P1.5.2 moment =

A

force x perpendicular distance from the pivot

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6
Q

P1.5.2 equilibrium

A

no resultant force and no resultant turning effect

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7
Q

P1.5.4 Pressure =

A

force / area

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8
Q

P2.2 kinetic energy =

A

0.5 x m x v^2

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9
Q

P2.2 GPE (gravitational potential energy) =

A

mgh

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10
Q

P2.2 change in GPE =

A

m x g x change in h

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11
Q

P2.4 sun is the source of ____ for all our ____ resources, except 3 which are..

A

energy, energy,
geothermal, nuclear, tidal

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12
Q

P2.4 source of tidal energy

A

mainly the moon

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13
Q

P2.4 energy is releases by ____ in the Sun

A

nuclear fusion

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14
Q

P2.4 efficiency of energy = (formula

A

(useful energy output / energy input)
x 100%

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15
Q

P2.4 efficiency of power = (formula

A

(useful power output / power input)
x 100%

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16
Q

P4.3 speed of electromagnetic waves in a vacuum

A

3.0 x 10^8 m/s

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17
Q

P4.4 approximate range of audible frequencies for a healthy human ear

A

20Hz to 20000Hz

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18
Q

P5.2 unlike charges ____, like charges ____

A

attract , repel

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19
Q

P5.2 electric field

A

region in which an electric charge experiences a force

20
Q

P5.2.2 Current :

A

rate of flow of charge,
I = Q (charge) / T

21
Q

P5.2.2 current in metals is due to ..

A

a flow of electrons

22
Q

P5.2.2 A flow of electrons causes a _____ in metals

A

current

23
Q

P5.2.3 Resistance =

A

p.d / current

= V / I

24
Q

P2.1 Work done =

A

force x distance

25
Q

P4 speed =

A

frequency x wavelength

26
Q

P4 speed

A

distance the wave travels in 1s

27
Q

P4 frequency

A

number of complete waves that go past each second (unit : Hz)

28
Q

P4 wavelength

A

(of a transverse wave) : distance between two adjacent peaks / troughs of the wave

29
Q

P4 amplitude

A

(of a water wave) maximum displacement of the water from undisturbed position. // half the crest-to-trough height

30
Q

P4 wavefront

A

moving line that joins all the points on the crest of a wave

31
Q

Principle focus

A

point where the parallel light rays arriving along the axis of the lens all cross over

32
Q

focal length

A

the distance at which principal focus happens // distance between principal focus and the centre of the lens

33
Q

speed of electromagnetic waves in a vacuum

A

3.0 x 10^8 m/s

34
Q

speed of electromagnetic waves in a ___ is 3.0 x 10^8 m/s

A

vacuum

35
Q

speed of ______ waves in a vacuum is 3.0 x 10^8 m/s

A

electromagnetic

36
Q

use of radio waves

A

radio, television communications

37
Q

use of microwaves

A

satellite television & telephones

38
Q

use of infrared

A

electrical appliances, remote controllers for televisions, intruder alarms

39
Q

use of X-rays

A

medicine, security

40
Q

all electromagnetic waves travel with..

A

same high speed in a vacuum and approximately same in air

41
Q

solidification

A

substance changes from liquid to solid

42
Q

condensation

A

substance changes from gas to liquid

43
Q

electromagnetic force (e.m.f)

A

energy supplied by the source per unit charge in driving the charge round a complete circuit

44
Q

P7.3 current-carrying coil in a magnetic field experiences a _____

A

turning effect

45
Q

____coil in a magnetic field experiences a turning effect

A

current-carrying

46
Q

current-carrying coil in a _______ experiences a turning effect

A

magnetic field

47
Q

how can a turning effect increase

A

increasing the number of turns on the coil, increasing the current, increasing the strength of the magnetic field

Science (6 decks)

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