Specification

Question 0

use correctly the named units listed in this specification as appropriate…

Answer 0

Electrical current-Amperes-A
Amount of substance- moles-Mol
Mass-kilograms-kg
Time-seconds-s
Distance-metres-m
Temperature-kelvin-K

Question 1

What do some physical quantities consist of?

Answer 1

some physical quantities consist of a numerical magnitude and a unit e.g. Time in seconds, mass in kg…

Question 2

The unit prefixes…

Answer 2

pico (p)10^-12,
nano (n)10^-9,
micro (μ)10^-6,
milli (m) 10^-3,
centi (c)10^-2,
kilo (k)10^3,
mega (M)10^6,
giga (G)10^9,
 tera (T)10^12

Question 3

define scalar and vector quantities and give examples

Answer 3

Scalar- a quantity with magnitude, but not direction e.g. Mass, distance, speed…
Vector- a quantity with magnitude and direction e.g. Velocity, momentum, electrical current

Question 4

draw and use a vector triangle to determine the resultant of two coplanar vectors such as displacement, velocity and force;

Answer 4

Vector triangle rules-
In drawing the triangle, A+B=C
They have to be right angled triangles to work out the resultant.
Pythagoras for the length, soh cah toa for the angle which gives the direction.