physics

Question 1

Normal

Answer 1

90 degrees from the surface

Question 2

incident ray

Answer 2

ray of light going toward the surface

Question 3

reflected ray

Answer 3

ray light coming away from the surface

Question 4

i°

Answer 4

angle of incidence

Question 5

r°

Answer 5

angle of reflection

Question 6

law of reflection

Answer 6

angle of I° is equal to r°

Question 7

specular reflection

Answer 7

light meeting the surface in one direction is all reflected in one direction.

Question 8

diffuse scattering

Answer 8

When light is reflected off a surface in all directions.

Question 9

density

Answer 9

mass / volume

Question 10

refraction

Answer 10

process which a wave changes speed and direction when entering a different density.

Question 11

refraction into denser material does what to the ray

Answer 11

it bends towards the normal

Question 12

refraction into a less dense material does what to the ray

Answer 12

it bends away from the normal

Question 13

spectrum of light

Answer 13

A series of similar waves arranged in order of wavelength or frequency.

Question 14

frequency

Answer 14

The number of waves produced each second. measured in hertz (Hz).

Question 15

dispersion

Answer 15

Spreading out of the different wavelengths of light, caused by refraction of light as it passes through a prism.

Question 16

what are the secondary colours of light?

Answer 16

cyan (light blue) , yellow, magenta (reddish pink)

Question 17

why are objects coloured?

Answer 17

because the object absorbs all light waves except its own colour.

Question 18

what is the relationship between speed, distance and time? (the triangle)

Answer 18

distance / (speed x time)

Question 19

speed

Answer 19

a measure of how fast an object is moving. m/s

Question 20

distance

Answer 20

Numerical description of how far apart two things are. m

Question 21

time

Answer 21

how long an event lasts, s

Question 22

unit

Answer 22

the measurement of a quantity.

Question 23

what is the relationship between pressure, force and area. (triangle)

Answer 23

Force/ (Pressure x area)

Question 24

force

Answer 24

pushes and pulls in a particular direction. measured in newtons (N)

Question 25

Area

Answer 25

how much space a flat shape takes up. measured in m²

Question 26

what is weight?

Answer 26

mass x gravitational pull (10)

Question 27

constant speed

Answer 27

When the speed of an object remains the same

Question 28

what is a distance-time graph?

Answer 28

A graph with distance travelled plotted on the vertical axis against time taken on the horizontal axis.

Question 29

what is a journey?

Answer 29

the motion of an object over time

Question 30

what is gradient?

Answer 30

the rise over the run. (the change in the 'y' value divided by the change in the 'x' value) y2 - y1 ---------- x2 - x1

Question 31

accelerating

Answer 31

The rate of change of speed increases. acceleration increases.

Question 32

decelerating

Answer 32

When an object is slowing down.

Question 33

stationary

Answer 33

when an object is not moving

Question 34

what is the average speed calculated from a distance/time graph

Answer 34

total distance traveled / total time spent

Question 35

what does a flat line mean in a distance/time graph?

Answer 35

that the speed of an object is constant (even if its stationary)

Question 36

what does a curve line mean on a distance/time graph?

Answer 36

the acceleration or deceleration.