1.3 how do we measure physical quanities + 1.4 what are scalars and vectors

Question 1

what measuring instruments can be used to measure length

Answer 1

meter rule, measuring tape, digital calipers, micrometer screw gauge

Question 2

meter rule

Answer 2

• commonly used to measure length
• can measure lengths of up to 1m

Question 3

measuring tape

Answer 3

• commonly used to measure length
• suitable for measuring distances longer than 1m

Question 4

digital calipers

Answer 4

-measures the internal and external diameter of an object accurately

Question 5

parts of a digital calipers

Answer 5

inside jaws
outside jaws
locking screw
digital display
zero button
scale
tail

Question 6

(digital calipers) inside jaws

Answer 6

measures the internal diameter of an object

Question 7

(digital calipers) outside jaws

Answer 7

measures external diameter or width of an object

Question 8

(digital calipers) digital display

Answer 8

shows the numeric value

Question 9

(digital calipers) zero button

Answer 9

resets the displayed length back to zero

Question 10

(digital calipers) tail

Answer 10

measures the depth of an object

Question 11

digital micrometer screw gauge

Answer 11

• measures object too small to be measured by digital calipers

Question 12

parts of a digital micrometer screw gauge

Answer 12

anvil
splindle
scale
ratchet
thimble
digital display
zero button

Question 13

how does a digital micrometer screw gauge work

Answer 13

1. the object is placed between the anvil and spindle
2. the ratchet is turned until the spindle is in contact with the object
   (ensure that the object is held tightly between the anvil and spindle. do not tighten ratchet too much)

Question 14

(digital micrometer screw gauge) ratchet

Answer 14

can be turned to adjust the spindle so that the spindle is in contact with the object

Question 15

(digital micrometer screw gauge) digital display

Answer 15

used to show the numeric value

Question 16

(digital micrometer screw gauge) zero button

Answer 16

used to reset the displayed length back to zero

Question 17

precision of an instrument

Answer 17

the smallest until an instrument can measure

Question 18

smallest division measured by measuring tape

Answer 18

0.1cm (1mm)

Question 19

smallest division of meter rule

Answer 19

0.1cm (1mm)

Question 20

smallest division of digital calipers

Answer 20

0.001cm (0.01mm)

Question 21

measuring range of digital calipers

Answer 21

0 to 15 cm

Question 22

smallest division of digital micrometer screw gauge

Answer 22

0.0001cm or 0.001mm

Question 23

oscillation

Answer 23

a complete to and fro motion

Question 24

pendulum use

Answer 24

-used to measure time

Question 25

motion of pendulum

Answer 25

moves back and forward at regular intervals

Question 26

parts of pendulum

Answer 26

consists of a bob (heavy metal ball) that is attached to one end of a string

Question 27

period of a simple pendulum

Answer 27

time taken for one complete oscillation

Question 28

pendulum clock

Answer 28

used to measure time using a pendulum’s periodic swing

Question 29

clocks and stopwatches

Answer 29

oscillations of springs and natural vibration of crystals are period motion that can be used to keep time

Question 30

how long is human reaction time

Answer 30

0.3-0.5 sec

Question 31

scalar quantities

Answer 31

physical quantities that only have magnitude

Question 32

vector quantities

Answer 32

physical quantities that have both magnitude and direction

Question 33

example of scalar quantities

Answer 33

-distance -speed -mass -energy -time

Question 34

example of vector quantities

Answer 34

-displacement -velocity -acceleration -force -weight

Question 35

distance

Answer 35

total length covered by a moving object regardless of direction of motion

Question 36

displacement

Answer 36

distance measured in a straight line in a specific direction

Question 37

speed

Answer 37

distance moved per unit time

Question 38

velocity

Answer 38

rate of change of displacement

Question 39

SI unit if speed

Answer 39

meter per second (m/s)

Question 40

SI unit for velocity

Answer 40

meter per second (m/s)

Question 41

speed formula

Answer 41

distance/time taken

Question 42

velocity formula

Answer 42

displacement/time taken