physics keywords

Question 1

what does oscillation mean?

Answer 1

vibrations

Question 2

define wavelength

Answer 2

distance from one point on a wave to the same point on the next wave

Question 3

Define amplitude

Answer 3

distance from rest point line to the peak or the trough

Question 4

define frequency

Answer 4

the number of waves per second

Question 5

define a transverse wave

Answer 5

a wave vibrating 90 degrees from energy transfer

Question 6

define a longitudinal wave

Answer 6

a wave vibrating parallel to energy transfer

Question 7

define velocity

Answer 7

speed in a particular direction

Question 8

define echo

Answer 8

reflected sound wave

Question 9

what is the units for wavelength ?

Answer 9

meters (m)

Question 10

what is the units for frequency ?

Answer 10

Hertz (Hz)

Question 11

how do find out the wave velocity ?

Answer 11

wave velocity = frequency x wavelength

Question 12

what is a wave ?

Answer 12

transfer of energy

Question 13

define compression

Answer 13

vibration close together ( longitudinal)

Question 14

define rarefaction

Answer 14

vibrations far apart ( longitudinal)

Question 15

what type of wave is an EM wave?

Answer 15

transverse

Question 16

how do you find out the wavelength

Answer 16

wavelength = wave velocity / frequency

Question 17

how do you find out the frequency

Answer 17

frequency =wave velocity / wavelength

Question 18

define independent variable

Answer 18

the variable you investigate ( i am going to change this & see what happens to my results)

Question 19

define dependent variable

Answer 19

the factor that is going to be my result. this is the factor i am measuring to collect my data

Question 20

define control variable

Answer 20

any factor that may effect the results, so i need to keep it the same ,if i don’t my data will be wrong

Question 21

how do you find percentage change

Answer 21

(difference /original) x 100

Question 22

what is the equation for speed ?

Answer 22

speed = distance/ time

Question 23

what is the equation for the time taken ?

Answer 23

time =distance/ speed

Question 24

what is the equation for distance ?

Answer 24

distance =speed x time

Question 25

what are EM waves ?

Answer 25

waves that travel through a vacuum of space

Question 26

name each EM wave in decreasing order

Answer 26

Gamma rays, X-rays,ultra violet waves,viable light waves ,infrared waves,microwaves , radio waves

Question 27

define accuracy

Answer 27

considered accurate if it is judged to be close to the true value

Question 28

define precise

Answer 28

measurement are ones in which there is very little spread about the mean value

Question 29

how can you implicate radio-waves

Answer 29

communication

Question 30

how can you implicate microwaves

Answer 30

mobile phones communication and cooking food

Question 31

how can you implicate infrared waves

Answer 31

remote controls and infrared cameras

Question 32

how can you implicate visible light waves

Answer 32

photography and traffic lights

Question 33

how can you implicate ultra violate waves

Answer 33

tanning beds, sterilize food and medical instruments

Question 34

how can you implicate x-rays

Answer 34

medical imaging and airport security

Question 35

how can you implicate gamma rays

Answer 35

medical treatment

Question 36

dangers of gamma rays

Answer 36

damage cells causing mutation cell death

Question 37

dangers of x-rays

Answer 37

to much can lead to cancerous calls

Question 38

dangers of ultra violet waves

Answer 38

damage eyes,skin cells and skin cancer

Question 39

dangers of visible light

Answer 39

damage the retina of the eye but normally not dangerous

Question 40

dangers of infrared

Answer 40

causes skin to burn. prolonged exposure can cause eye damage

Question 41

dangers of microwaves

Answer 41

causes internal heating of body tissue

Question 42

dangers of radiowaves

Answer 42

heating of body tissue and increase body temp

Question 43

what is the equation voltage

Answer 43

voltage=current x resistance (V=IR)

Question 44

define scalar quantity

Answer 44

a quantity that has size (magnitude) but no direction

Question 45

define vector quantity

Answer 45

a quantity that has both size and direction

Question 46

define mass

Answer 46

measurement of how many particles are in your body. does not change

Question 47

what is mass measured in

Answer 47

kilograms (kg)

Question 48

define weight

Answer 48

the measurement of the pull of gravity on your body.depends on what planet your on

Question 49

what is weight measured in

Answer 49

Newtons (N)

Question 50

what is a resultant force ?

Answer 50

a single force that represents all of the forces together

Question 51

what is the equation for acceleration?

Answer 51

change in velocity / time taken or force / mass

Question 52

what is the units for acceleration?

Answer 52

m/s(squared)

Question 53

factors affecting thinking distance

Answer 53

alcohol, drugs, tiredness and caffeine

Question 54

factors affecting breaking distance

Answer 54

steepness, friction of road,condition of triers, condition of road, weather, break condition,

Question 55

factors affecting thinking and braking distance

Answer 55

speed

Question 56

area of square

Answer 56

= length x length

Question 57

area of rectangle

Answer 57

= length x width

Question 58

area of trapezium

Answer 58

=1/2(sum of parallel sides) x height

Question 59

area of triangle

Answer 59

=1/2 base x height

Question 60

area of parallelogram

Answer 60

=base x perpendicular height

Question 61

equation for stopping distance

Answer 61

stopping distance= thinking distance + braking distance

Question 62

volume of sphere

Answer 62

=4/3 x (pie)r(power of three)

Question 63

surface area of a sphere

Answer 63

=4(pie)r(squared)

Question 64

volume of a cube

Answer 64

=L x W x H

Question 65

surface area of a cube

Answer 65

=6(area)