Units Flashcards
C
Coulomb, Electric Charge
A s
F
farad, Capacitance
A squared s^4/
(kg m^2)
H
henry, inductance
kg m^2/(A^2 s^2)
Hz
hertz, frequency
s^-1
J
joule, energy and work
kg (m^2/s^2)
N
Newton, Force
kg m/s^2
Ω
Ohm, elec resistance
kg m^2/(A^2 s^2)
Pa
Pascal, Pressure
kg/ (m s^2)
T
Tesla, Magnetic field
kg/(A s^2)
V
Volt, electric potential
kg m^2/(A s^3)
W
Watt, power
kg m^2/s^3
A
Ampere, unit of electric current
cd
candela, luminous intensity
sec θ
1/ cos θ = H/A
csc θ
1/sin θ = H/O
cot θ
1/tan θ = A/O
Laws of Sine
Sin A/a = Sin B/b = Sin C/c
a/Sin A= b/Sin B = c/ Sin C
Law of Cosines
c^2 = a^2 + b^2 − 2ab cos(C)
Weight
m g
g= 9.81 m/sec^2
Density
Mass/Volume kg/m^3
ρ = m/V
Average Speed
distance/time = v
d/t
Average Velocity
Displacement/ time = v
d/t
Average acceleration
Change in velocity/time
Frictional Force
Ff= u FN
If the object is not moving, you are dealing with static friction and it can have any value from zero up to u FN
If the object is sliding, then kinetic friction and it will be constant and equal to ukFN
Torque
T = F * r * sinθ
Where θ ist he angel between F and L; unit : Nm
Work
F D cos θ
D is the distance moved and θ is the angle between F and the direction of motion; unit J
Power
rate of work done Power = Work/time Unit: Watt Efficiency = Work_out / Energy_ in Mechanical advantage = force out/force in
Constant acceleration Linear Motion 5 equations
x, v, t, a, v_o
Constant acceleration Linear Motion, missing x
v = v_o + at
Constant acceleration Linear Motion, missing v
(x-x_o) = v_o t + 1/2a t^2
Constant acceleration Linear Motion, missing t
v^2 = v_o^2 + 2a(x-x_o)
Constant acceleration Linear Motion, missing a
(x-x_o) = 1/2 (v_o +v)t
Constant acceleration Linear Motion, missing v_o
(x-x_o) = v t - 1/5at^2
