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science 8 > semester 1 exam > Flashcards

semester 1 exam Flashcards

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1
Q

what is a fire blanket used for

A

put out fire on human

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2
Q

tool used to measure volume

A

graduated cylinder

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3
Q

tool used to handle hot things

A

tongs or gloves

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4
Q

units of conversions (King Henry Died By Drinking Chocolate Milk

A

Kilo Hecto Deka Base Deci Centi Milli

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5
Q

measurement of volume

A

liter

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6
Q

measurement for length

A

meter

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7
Q

measurement for mass

A

gram

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8
Q

measurement for temperature

A

degrees celsius

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9
Q

A solid has a _______ shape and a _______ volume

A

definite, definite

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10
Q

A liquid takes the ______ of its container and has a ______ volume

A

shape, Definite

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11
Q

A gas _____ its container and has _____ definite volume

A

fills, no

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12
Q

True or False: particles in matter are always moving

A

True

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13
Q

Waves transfer ______from place to place, and it spreads ______ from the source.

A

energy, out

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14
Q

mechanicall wvae

A

longitudinal wave that disturbs the medium

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15
Q

compression

A

region of a longitudinal wave where the particles are the closest together; similar to crest on a transverse wave

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16
Q

rarefaction

A

region of a longitudinal wave where the particles are the farthest apart; similar to trough on a transverse wave

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17
Q

wave where the particles move perpendicular to the direction which the energy moves

A

transverse wave

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18
Q

wave where the particles move parallel to the direction which energy moves

A

longitudinal wave

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19
Q

longitudinal wavelength can be found by measuring:

A

compression to compression rarefaction to rarefaction compression to rarefaction

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20
Q

transverse wavelength can be found by measuring:

A

crest to crest trough to trough crest to trough

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21
Q

amplitude

A

measured by distance between midline and crest or midline and trough; shows how much energy the wave carries

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22
Q

sound waves travel fastest through…

A

solid

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23
Q

molecule in solid are…

A

the closest together

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24
Q

sound waves travel faster through ______ materials

A

denser

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25
Q

sound waves travel slowest through _____ materials

A

colder

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26
Q

molecules in cold materials move…

A

slower

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27
Q

sound waves travel slowest in______ materials

A

more elastic

28
Q

true or false: particles in elastic materials bounce back quickly

A

true

29
Q

electromagnetic waves travel fastest through a _____

A

vacuum

30
Q

molecules in a vacuum are the ______

A

farthest apart

31
Q

why do you see lightning before you hear thunder

A

sound travels slower than sound

32
Q

elasticity

A

ability for the molecules of an object to bounce back or return to its original shape

33
Q

the scale that loudness of a sound wave is measured by

A

decibel scale

34
Q

main causes of hearing loss

A

loud noises aging injury/infection

35
Q

what is the main cause of hearing loss for teenagers and young adults

A

loud music or sounds

36
Q

frequency

A

measure of how many waves pass in one second

37
Q

hertz

A

unit frequency is measured in

38
Q

order of the electromagnetic spectrum (longest to shortest wavelength)

A

radio waves, microwaves, infrared, light rays, ultra violet, x-rays, gamma rays

39
Q

gamma rays

A

waves that have the highest frequency, and the shortest wavelength

40
Q

radio waves

A

waves that have the lowest frequency, and the longest wavelength

41
Q

in a vacuum all EM waves have the same

A

speed

42
Q

how are EM waves drawn

A

as transverse waves

43
Q

what kind of wave are EM waves

A

transverse

44
Q

how do the particles of transverse waves move in relation to the energy

A

perpendicular

45
Q

light rays (visible light)

A

the only part of the electromagnetic spectrum we can see with the naked eye

46
Q

what causes us to see different colors

A

the light that is either absorbed or reflected

47
Q

the color black does what

A

absorbs all of the suns energy

48
Q

Law of reflection

A

the angle of incidence is the same as the angle of reflection

49
Q

transparent

A

object where all light can pass through it

50
Q

translucent

A

object that allows some light to pass through it

51
Q

opaque

A

object that allows no light pass through it

52
Q

refraction

A

bending of light as it enters a new medium happens when light slows down as it passes from air into water

53
Q

forms of energy

A

sound, light

54
Q

force

A

a push or a pull

55
Q

newtons

A

SI or metric units for force

56
Q

newton’s first law

A

law of inertia: an object at rest tends to stay at rest and an object in motion tends to stay in motion unless acted on by an outside for

57
Q

newton’s second law

A

force equals mass times acceleration F=ma

58
Q

newton’s third law

A

for every action there is an equal but opposite reaction

59
Q

true or false: unbalanced forces can cause a change in speed or direction

A

false

60
Q

acceleration due to gravity on a person or object on the surface of a planet is

A

9.8 meters squared

61
Q

weight

A

The force of gravity on a person or object’s mass calculated mass x gravity

62
Q

difference between speed and velocity

A

speed is how fast an object is going where velocity is how fast an object is going in a certain direction

63
Q

Joules

A

unit energy is measured in

64
Q

law of conservation of energy

A

energy can never be created or destroyed only transformed from one type to another

65
Q

potential energy

A

energy that is stored or at rest; formula: weight/height

66
Q

kinetic energy

A

energy of motion

science 8 (1 decks)

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