unit 3 notes

Question 1

1. planning

independent variable

Answer 1

a variable physical quantity

the values of which are chosen by the person doing the experiment

Question 2

1. planning

dependent variable

Answer 2

a variable physical quantity

the values are not chosen by the person doing the experiment
but change with another variable

Question 3

1. planning
   - identifying the equipment

precision 
metre rule 
vernier caliper 
vernier caliper digital 
micrometer screw gauge
protractor

Answer 3

smallest scale division

metre rule - 0.1 cm

vernier caliper - 0.01 cm

vernier caliper digital - 0.001 cm

micrometer screw gauge - 0.01 mm

protractor - 1 degree

Question 4

1. planning
   - identifying the equipment

precision 
stopwatch
thermometer
measuring cylinder
newton meter
electronic balance

Answer 4

stopwatch

• 0.01 s
• 0.1 s reaction time

thermometer

• 1 degree celsius
• 0.5 degree celsius

measuring cylinder

• 1 cm ^3
• 0.5 cm ^3

newton meter

• 0.2 N
• 0.1 N

electronic balance

• 0.01 g
• 0.01 g/ refer manual

second reading is uncertainty

Question 5

1. planning
   - identifying the equipment

range

Answer 5

different btwn smallest value and largest value set of readings

Question 6

sensitivity

Answer 6

the change in response of an instrument divided by the corresponding change in stimulus

sensitivity of temperature
= change in length/ change in temp
unit - mm/c degree

Question 7

to identify equipment

procedure

Answer 7

1. estimates a range of values that will be needed for the exp
2. chooses the instrument
3. estimate precision
4. calculate percentage uncertainty
5. make conclusion on selecting instrument