1. now from the top, make it drop, that's some WAAP [COMPLETE]

Question 1

Define speed

Answer 1

rate of change of distance

Question 2

define velocity

Answer 2

rate of change of displacement

Question 3

define distance

Answer 3

distance refers to how much ground an object has covered during its motion

Question 4

define displacement

Answer 4

displacement refers to how far out of place an object is and is the overall change in the objects position

Question 5

base unit of mass

Answer 5

kilogram - kg

Question 6

base unit of length

Answer 6

metre - m

Question 7

base unit of time

Answer 7

seconds - s

Question 8

base unit of temperature

Answer 8

kelvin - k

Question 9

base unit of electrical current

Answer 9

ampere - A

Question 10

base unit of amount of substance

Answer 10

moles - mol

Question 11

T

Answer 11

tera - 10^12

Question 12

G

Answer 12

giga - 10^9

Question 13

M

Answer 13

mega - 10^6

Question 14

k

Answer 14

kilo - 10^3

Question 15

d

Answer 15

deci - 10^-1

Question 16

c

Answer 16

centi - 10^-2

Question 17

m

Answer 17

milli - 10^-3

Question 18

µ

Answer 18

micro - 10^-6

Question 19

n

Answer 19

nano - 10^-9

Question 20

p

Answer 20

pico - 10^-12

Question 21

Derive Hz

Answer 21

Frequency = 1/time
f=1/t
f=1/s=s^-1

Question 22

Derive Pa (pascal)

Answer 22

pressure = force/area
p=F/A
p=ma/A
p=kg m s^-2/m^2
p=kg m^-1 s^-2

Question 23

Derive J (joule)

Answer 23

work done = forcedistance
W=fd
W=mad
W=kg m s^-2 m
W=kg m^2 s^-2
——————————————————————-
Kinetic energy = 1/2mass*velocity^2
E=0.5mv^2
E= kg (m s^-1)^2
E= kg m^2 s^-2

Question 24

what are homogenous equations

Answer 24

units on both sides of the equation are equal

Question 25

prove that v^2 = u^2 +2as is homogenous

Answer 25

v^2
=(ms^-1)^2
=m^2 s^-2
—————————————————————-
u^2 + 2as
=(ms^-1)^2 + ms^-2 m
=m^2 s^-2 + m^2 s^-2
=m^2 s^-2

Question 26

What is accuracy

Answer 26

accuracy is how close to the real value

Question 27

What is precision

Answer 27

precision is how close the results are together

Question 28

What are random errors

Answer 28

random errors are unpredictable and occurs by chance

Question 29

How do random errors typically affect a graph

Answer 29

random errors typically affect the gradient of the graph

Question 30

how to reduce the effect of random errors

Answer 30

to reduce the effect of random errors, take multiple measurements

Question 31

What are systematic errors

Answer 31

Systematic errors happens consistently and will affect all measurements by the same amount

Question 32

how do systematic errors affect a graph

Answer 32

systematic errors will not affect the gradient of the graph but will displace the line

Question 33

examples of systematic errors

Answer 33

-zero error
-parallax

Question 34

what is the absolute uncertainty of a DATA SET

Answer 34

half the range of the data set

Question 35

What is the absolute uncertainty of a device

Answer 35

the absolute uncertainty is the smallest scale reading of that instrument

Question 36

how to work out percentage uncertainty

Answer 36

percentage uncertainty

(absolute uncertainty/value)*100

Question 37

what uncertainty to use when data is added or subtracted

Answer 37

add absolute uncertainty

Question 38

what uncertainty to use when data is multiplied or divided

Answer 38

add percentage uncertainties

Question 39

What to do with the uncertainty when data is raised to the power of n

Answer 39

Multiply the percentage uncertainty by the power

Question 40

What does the error bar on the graph tell us

Answer 40

the error bar shows the absolute uncertainty

Question 41

How to draw the line of worst acceptable fit

Answer 41

draw a line from the bottom of the first error bar and the top of the last error bar or vice versa

Question 42

how to work out percentage uncertainty in the gradient

Answer 42

percentage uncertainty of gradient

[ (best gradient-worst gradient)/best gradient ] * 100

Question 43

derive N (newton)

Answer 43

force (N) = mass (kg) * acceleration (ms^-2)
=kg m s^-2

Question 44

derive W (watt)

Answer 44

power (W) =work (or energy) (J) / time (s)
=J s^-1
———————————————————–
J = N * m
J = kg * m * s^-2 * m
J = kg m^2 s^-2
———————————————————–
W = kg m^2 s^-2 s^-1
=kg m^2 s^-3

Question 45

derive C (coulomb)

Answer 45

charge (C) = current (I) * time (s)
=As

Question 46

derive V (volt)

Answer 46

potential difference (V) = energy (J) / charge (C)
=kg m^2 s^-2 / As
=kg m^2 A^-1 s^-3

Question 47

derive Ω (ohm)

Answer 47

resistance (Ω) = p.d. (V) / I (A)
=kg m^2 A^-1 s^-3 / A
=kg m^2 A^-2 s^-3