definitions + formulas Flashcards
physical quantity
quantity that can be measured, consisting of numerical magnitude and unit
scalar quantity
physical quantities that have magnitude only
vector quantity
physical quantities that have both magnitude an direction
speed
distance moved per unit time
velocity
rate of change of displacement
acceleration
rate of change of velocity
A = final velocity - initial velocity / time taken
G
giga
1x10^9
M
mega
1x10^6
k
kilo
10^3
d
deci
10^-1
c
centi
10^-2
m
milli
10^-3
µ
micro
10^-6
n
nano
10^-9
Newton’s 1st Law
every object will continue in its state of rest or uniform motion in a straight line unless a resultant force acts on it (RF=0 -> _ - _ = 0)
Newton’s 2nd Law
when resultant force acts on an object of a constant mass the object will accelerate in direction of resultant force (RF = ma)
Newton’s 3rd Law
if body A exerts a force Fab on body B, body B will exert an equal and opposite force Fba on body A
mass
amount of matter in a body
weight
gravity acting on an object
W = mg
unit = N
gravitational field
region in which a mass experiences a force due to gravitational attraction
gravitational field strength
gravitational force acting per unit mass (Nkg^-1)
what is inertia, with an example
reluctance of an object to change its state of rest or motion due to its mass (higher mass = higher inertia)
density
density = mass/volume
unit is kgm^-3
