1What is the definition of a physical quantity
A quantity that can be measured. It consists of a numerical magnitude and a unit
2What's the SI unit for length, mass and time
Metre, Kilogram and second
3What's the SI unit for electric current, temperature and amount of substance
Ampere, Kelvin's and mole
4What's the factor for kilo, mega, giga and tera
$10^3, 10^6, 10^9, 10^{12}$
5What's the factor for nano, micro, milli, centi and deci
$10^{-9}, 10^{-6}, 10^{-3}, 10^{-2}, 10^{-1}$
6What is standard form for Km
$1 \times 10^3m$
7How to calculate standard form from a super large number
Take the decimal point and move it either back or forwards depending on whether its a negative or positive number respectively. Do it until you reach the 3sf point and the number of times you move the decimal point is the power of 10
8So, what's the standard form of 768898123
$7.68 \times 10^8$
9What's the precision of both the measuring tape and the metre ruler
1mm or 0.1cm
10What's the precision of the digital caliper?
0.01mm or 0.001cm
11What's the precision of the digital micrometer screw gauge?
0.001mm or 0.0001cm
12Why is the precision of a stopwatch of 0.01s considered insignificant?
Because the human reaction time is 0.3 to 0.5s making it insignificant
13What d.p is time recorded in?
1 d.p
14What is one oscillation?
One complete to and fro motion
15What is the period of a pendulum?
The time taken for one complete oscillation
16What causes the period of a pendulum to increase?
When the length of the pendulum increases or when gravitational field strength decreases
17What's the formula to find the period of a pendulum
(t1 + t2)/2 then divided by 20
18What is a scalar quantity?
A quantity that has only magnitude
19What are some examples of scalar quantities?
distance, speed, time, temperature, mass
20What is a vector quantity?
a quantity that has both magnitude and direction
21What are some examples of vector quantities?
displacement, velocity, acceleration, force
22What's the formula for speed?
$\frac{Distance}{Time}$
23What's the formula for velocity?
$\frac{Displacement}{time \ taken}$
24What's the definition of speed?
Distance moved per unit time
25What's the definition of velocity
Rate of change of displacement