Foundation of physics

Question 1

What is temperature measured in?

Answer 1

Kelvins

Question 2

Tera

Answer 2

10 to the 12

Question 3

Giga

Answer 3

10 to the 9

Question 4

Mega

Answer 4

to the 6

Question 5

Killo

Answer 5

10 to the 3

Question 6

deci

Answer 6

-1

Question 7

centi

Answer 7

-2

Question 8

milli

Answer 8

-3

Question 9

micro

Answer 9

-6

Question 10

nano

Answer 10

-9

Question 11

pico

Answer 11

-12

Question 12

What is the base unit and derived unit for frequency?

Answer 12

derived - Hz
base - s to the minus one

Question 13

Pressure derived and base unit

Answer 13

Pa - derived
Base - kg m to the minus one and s to the minus 2

Question 14

What are the equations for work>

Answer 14

= Fd
= 1/2mv^2
=mgh

Question 15

What are the base and derived units for work?

Answer 15

Derived - joules
Base - kgm^2s^-2

Question 16

What is a homogenous equation?

Answer 16

The units on the left ware the same as the units on the right, eg v^2 equals u^2 plus 2as

Question 17

What are the two types of errors?

Answer 17

Random and systematic

Question 18

What are random errors?

Answer 18

-unpredictable
- will affect gradient of graph
- to reduce this, take multiple measurements

Question 19

What is a systematic error?

Answer 19

• Affects all measurements by the same amount, eg the zero error, or parallax error
• It will not affect the gradient of the graph but will displace it

Question 20

What is a zero error?

Answer 20

EG - having a scale that instead of being at 0, it is displaced by a few grams and all results are displaced by this much

Question 21

What is a parallax error?

Answer 21

Where you’re not looking at a measurement at eye level

Question 22

How can we calculate the absolute uncertainty?

Answer 22

Half of the range, half of the highest value take away the lowest value

Question 23

Find the absolute uncertainty of the following data set:
9.75
9.60
9.85
9.73

Answer 23

9.85-9.60 divided by 2

Mean value = 9.73
So absolute uncertainty is 9.72+-0.0125

Question 24

What is the absolute uncertainty of a device, eg ruler

Answer 24

The smallest scale reading of it, for a ruler it would be the given value=-1 mm

Question 25

What is the percentage uncertainty equation?

Answer 25

Absolute uncertainty divided by value times 100

Question 26

How do you calculate uncertainties when adding or subtracting values?

Answer 26

Add the absolute uncertainties

Question 27

How do you calculate uncertainties when multiplying or dividing values?

Answer 27

Add percentage uncertainties

Question 28

What is the percentage. uncertainty in y^n

Answer 28

The percentage uncertainty of y multiplied by n

Question 29

What does an error bar tell you?

Answer 29

The absolute uncertainty of the measurement

Question 30

How do you draw the line of worst fit?

Answer 30

Start at the bottom of the first error bar to the top of the last error bar

Question 31

How do you work out the percentage uncertainty in the gradient?

Answer 31

Best gradient-worst gradient divided by the best gradient times 100