FOP

Question 1

List the S.I base units (6)

Answer 1

Length m
Temperature K
Weight Kg
Time s
Current A
Amount of substance mol
(luminous density)

Question 2

What are derived units, how many

Answer 2

Units made from base units, 22

Question 3

Why are some units capitalised and others are not

Answer 3

Capitalised units are named after a scientist

Question 4

List the prefixes and their sizes

Answer 4

15 femto, 12 pico, 9 nano, 6 micro, 3 milli, 2 centi, 1 deci, 3 kilo, 6 mega, 9 giga, 12 tera, 15 pica

Question 5

What is homogenity and why is it used?

Answer 5

Either side quantities are same homogenous. Can indicate equation MAY correct

Question 6

How to minimilize errors?

Answer 6

Tak emultiple readins, discard anomalous results, calculate mean

Question 7

Describe random errors

Answer 7

By unkown and unpredicatble changes. Eg in equippment or environment.

Question 8

Describe human errors

Answer 8

When reading or recording values

Question 9

Describe systematic errors

Answer 9

Usually error in equipment - wrong with tool, data display or used incorrectly. Error can be substracted out of final readings (eg ruler prints 100cm but is 99cm)

Question 10

Describe zero error

Answer 10

When equipment reads anything but zero when nothing is acting on it

Question 11

Describe paralax error

Answer 11

Wrong eye level - incorrect reading taken

Question 12

What is ment by precision?

Answer 12

How close together repreated units are. Smaller interval higher precision

Question 13

What is ment by accuracy?

Answer 13

How close the calculated vlaue is to the commonly accepted/true value

Question 14

How does systematic and random errors efect accuracy and precision?

Answer 14

Systematic effects accuracy not precision
Random effects accuracy and precision

Question 15

What is resolution?

Answer 15

The smallest change in quanitity thar an instrument can measure

Question 16

How do you find uncerntainty in equipment?

Answer 16

Resolution is uncertainty

Question 17

Uncertianity when adding/subtracting values

Answer 17

Add the uncertainties

Question 18

Uncertainties when multiplying/dividing values

Answer 18

Find percentage uncertainties and add
Can find numerical uncertainty after

Question 19

How to find uncertainity and percentage uncertainity in graphs

Answer 19

Uncerntanty is best g - worse g
Percentage Uncertaintiy is (uncertainity/best g) * 100

Question 20

How to find uncertainty of y intercept?

Answer 20

Extrapolate best, min and max line. same rule as finding U and PU

Question 21

How to draw max and min line on graph

Answer 21

Max is bottom to top of error bars
vice versa

Question 22

Scalar has….?
Vector has….?

Answer 22

Magnitude
Magnitude and direction

Question 23

Difference between displacement and distance?

Answer 23

Displacement is vetor, distance is scalar

Question 24

How do you draw resolving vectors?

Answer 24

perpendicular

Question 25

What are 3 ways to find resultant force of non-perpendicular forces

Answer 25

1. Vector triangle (head to tail) then ruler and protractor
2. Sin and cos rules
3. Draw a perpendicular axis to one vector, use pytha

Question 26

Is momentum a vector or scalar?

Answer 26

Vector

Question 27

Is density a vector or scalar?

Answer 27

Scalar

Question 28

Is energy a Vector or scalar?

Answer 28

Scalar

Question 29

Is power a vector or scalar?

Answer 29

Scalar

Question 30

Is acceleration a vector or scalar?

Answer 30

Vector

Question 31

Is pressure a vector or scalar?

Answer 31

Vector