Ch 15 Measuring the Physical World

Question 1

what is quantity

Answer 1

the exact amount is number of things

Question 2

what is a physical quantity

Answer 2

a quantity that can be measured

Question 3

what is the metric system

Answer 3

the system of measuring physical quantities

Question 4

what is the si unit and symbol for length

Answer 4

metre (m). l

Question 5

what is the symbol and si unit for time

Answer 5

second (s) . t

Question 6

what is the symbol and si unit for mass

Answer 6

kilogram (kg). m

Question 7

what is the si unit and symbol for temperature

Answer 7

kelvin (k) . T

Question 8

what i the si unit and symbol for electric current

Answer 8

amperes (a). I

Question 9

what are derived units

Answer 9

units that are calculated by combining basic units in a specific way

Question 10

what can you use to measure the length of a straight line

Answer 10

ruler
meter stuck
trundle wheel
measuring tape

Question 11

what can you use to measure the length of curved lines

Answer 11

opisometer

trundle wheel

Question 12

what can you use for measuring widths thicknesses and lengths

Answer 12

vernier calliper

micrometer

Question 13

what is area

Answer 13

the amount of space taken up by a 2D shape

Question 14

what is mass

Answer 14

the amount of matter in an object

Question 15

what is volume

Answer 15

the amount of space an object takes up

Question 16

what do you use to measure the volume of a liquid

Answer 16

graduated cylinder

Question 17

what is a random error

Answer 17

an error causing specific readings to be to high or too low

Question 18

what is a systematic error

Answer 18

an error causing all readings to be above or below the right value

Question 19

what is a zero error

Answer 19

a type of systematic error caused by using an instrument that hasn’t been set to zero