Physical Quantities

What is the SI unt for length?

metre (m)

What is the SI unit for time?

second (s)

What is the SI unit for mass?

kilogram (kg)

What is the SI unit for electric current?

amphere (A)

What is the SI unit for temperature?

kelvin (K)

What is the SI unit for substance?

mol

What is the standard form for nano (n)?

10 power -9

What is the standard form for micro (µ)?

10 power -6

What is the standard form for milli (m)?

10 power -3

What is the standard form for centi ( c) ?

10 power -2

What is the standard form for deci (d)?

10 power -1

What is the standard form for kilo (k)?

10 power 3

What is the standard form for Mega (M)?

10 power 6

What is the standard form for Giga (G)?

10 power 9

What is the standard form for Tera (T)?

10 power 12

When changing from 2 SI unit to 1 SI unit, do we use ‘x’ or divide?

‘x’

Define random error and state 1 example

unpredictable and cluster around a mean value
eg. human error

Define systematic error and state 2 example

constant and predictable
e.g. zero error & human reaction time

What is the name of this instrument and state the SI unit.

digital calipers.
SI unit: metre (m)

What is the function of part A and the name?

internal jaw: measures the internal diameter of an object

What is the function of part B and the name?

external jaw: measures the external diameter of an object

What is the function of part C and the name?

tail: measures the depth of an object

When do we use the digital micrometer screw gauge?

when the object cannot be measured using the digital calipers

What is the name and function of part A?

anvil: measures the diameter of an object

What is the name and function of part B?

spindle: measures the diameter of an object

What is the name and function of part C?

ratchet: turned to adjust the spindle so that the spindle is in contact with the object

What is the meaning of oscillation?

from point A to B to C back to B and A

Define period.

time taken for 1 complete oscillation

What is amplitude? Does it affect the period of oscillation?

amplitude: length of an object
longer the length, longer the period
shorter the length, shorter the period

What is the difference between scalar and vector?

scalar has only magnitude but vector have both magnitude and direction

what are some common quantities for scalar?

energy, distance, speed, mass, time

what are some common quantities for vector?

displacement, velocity, acceleration, weight, force