Vocab & Units Flashcards
Length
m
Mass
kg
Time
s
Force
N
Energy
J
Power
W
Newton derived
kg ms^-2
Joule derived
kg m^2 s^-2
Watt derived
kg m^2 s^-3
kilo & symbol
10^3 (K)
mega & symbol
10^6 (M)
giga & symbol
10^9 (G)
tera & symbol
10^12 (T)
peta & symbol
10^15 (P)
milli & symbol
10^-3 (m)
micro & symbol
10^-6 (μ)
nano & symbol
10^-9 (n)
pico & symbol
10^-12 (p)
femto & symbol
10^-15
pressure derived
kg m^-1 s^-2
Pressure
Pa
Instantaneous Speed
The rate at which the distance travelled is changing at a moment in time
Displacement
The distance travelled in a certain direction
Velocity
The rate of change of displacement
Vector Quantity
Has both Magnitude and Direction
Scalar Quantity
Has only Magnitude
Acceleration
The rate of change of Acceleration
Free Fall
The only force acting on it is gravity
Newton
The force that will give a mass of 1 kg an acceleration of 1 ms^2
Moment
Magnitude of Force X Perpendicular distance of its line of action from the pivot
Couple
A pair of forces that are equal in magnitude but act in opposite directions
Torque of a couple
magnitude of one force X perpendicular distance between them
Conditions for Equilibrium
Resultant Force is 0, Resultant Torque is 0
Centre of Gravity
The point through which weight acts
Pressure
Force per unit area
Density
Mass per unit volume
Joule
Energy transferred when a force of 1 newton moves 1 metre.
Power
The rate at which energy is transferred
Watt
1 joule per second
Ductile Material
A material that stretches a lot beyond the elastic limit
Brittle Material
A material that snaps when it reaches the elastic limit
Polymeric Material
A material that does not show a linear behaviour
