NOCTI- Engineering Systems

force equations (3)

coefficient of friction x weight

work/distance

mass x acceleration

density equation (1)

mass/volume

equation for determinate system

2j = m+3

j=number of joints

m= number of members

work equations (3)

force x distance

pressure x area x length

pressure x volume of displaced liquid

power equations (3)

work/time

amps^2 (resistance) (aka watts)

I(V) or amps (voltage)

ideal mechanical advantage formula (1)

load/ideal effort

efficiency formula (1)

IMA/ AMA

Gear Ratios (2)

driving gear teeth/driven gear teeth

=

driving rotations per minute (RPM)/ driven rotations per minute (RPM)

Fahrenheit to Celcius conversion

F = (9/5)(C) + 32

torsion

turning force

shear

sliding force, force acting in opposite directions

compression

squeeze force, crushing together

tension

pulling apart

bending

compression and tension force

Parallel voltage

same

parallel resistance

1/R = 1/R(1) + 1/R(2) + 1/R(3)…

parallel amps

sum

series resistance

sum

sereis voltage

sum

sereis amps

same

Watt's law

P=IV

Kirchoff's Laws

sum of amount of current going into a node = sum of amount going current out of node

placement of ammeter

within the circuit

placement of voltmeter

just insert the leads between two points and the meter will read the voltage between those two points

alternating

polarity (condition of power supply being pos/neg), changes, current going back and forth

example: wall outlets

digital

the polarity (condition of the power supply being pos/neg) is constant

only 2 values (1/0 or ON/OFF)

example battery

flow rate formula

cross sectional area (velocity)

Bernoulli's Principle

when the pressure decreases, the resistance decreases, the speed of the fluid increases

Poiseuille's Law (about + 3 factors)

about the velocity of the fluid flow

cross sectional area of pipe

length of pipe

viscosity of fluid

viscosity

resistance to be deformed

hydraulic

fluid system

liquids like water and oil

good for lots of force

more accurate

pneumatic

fluid system

air

high speeds

no sparks, so more safe

air compressor

mechanical power system

transmits power via mechanical components like simple machines and relies on mechanical control devices

mechanical advantage formula

MA= output force/input force

Pascal's law

in a limited space, all fluids exert the same amount of pressure in all directions

absolute pressure

relative to vacuum

gauge pressure (relative to local atm) + atm pressure

analog

range of values