Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
37 Cards in this Set
- Front
- Back
|
Simple Machines
|
Simple machines redirect energy by manipulating FORCE, DISTANCE and/or SPEED
|
|
|
Actual mechanical advantage
|
AMA=R/E, R=Magnitude of resistance force
E=Magnitude of effort force |
|
|
Levers
|
Lever MA= LE/LR, LE=length to effort
LR= length to resistance |
|
|
Moment
|
Moment = Force x Distance
Moment Equilibrium: E * Le = R * Lr |
|
|
Wheel and axel IMA
|
IMA = De/ Dr
MA=R/E |
|
|
If the 6" diameter axle on a car turns a 24" diameter wheel, what is the mechanical advantage?
|
The mechanical advantage is 4
|
|
|
Pulley
|
Used to change the direction and magnitude of a force
AMA = Fr/Fe |
|
|
Gear Ratios
|
Change the speed of rotation
Change the direction of rotation Change the amount of torque available to do work |
|
|
What is inclined plan IMA
|
IMA = De/Dr
|
|
|
What is wedge IMA
|
IMA = De/Dr
|
|
|
Screw IMA
|
IMA = De/Dr
|
|
|
IMA formula
|
IMA = Circumference/Pitch=2(pie)re/P
|
|
|
What is energy?
|
The ability to do work
|
|
|
Examples of nonrenewable energy sources
|
Fossil fuels, Uranium
|
|
|
Examples of renewable energy sources
|
Animal, Food, biomass
|
|
|
Examples of inexhaustible energy sources
|
Hydroelectric/ tidal, Geothermal, Wind, Solar
|
|
|
What is work?
|
The product of the force (F) applied to an object over a distance (d) in which the object travels as a result of the force.
|
|
|
Work formula
|
W = F x d
|
|
|
What is the base unit of work?
|
Joule (j)
|
|
|
What does 1 joule equal?
|
1 joule = 1 newton x 1 meter
|
|
|
What is power?
|
Rate at which work is performed or energy is expanded
|
|
|
Power formula
|
P= W/t
W= Work t= time |
|
|
Power output:
|
Work / time
|
|
|
Power input:
|
Voltage * current
|
|
|
Efficiency formula
|
P out/ P in*100
|
|
|
Conversion of energy
|
Energy cannot be created or destroyed, but it can change from on form to another
|
|
|
Energy conversion
|
Changing one form of energy to another
|
|
|
Energy Efficiency
|
The ratio of the useful energy delivered by a dynamic system to the energy supplied to it
|
|
|
Entropy
|
The loss of energy during conversion
|
|
|
Electrical Circuit
|
A system of conductors and components forming a complete path for current to travel
|
|
|
Properties of an electrical circuit
|
Voltage, Current, Resistance
|
|
|
What are the two types of circuits?
|
Series and Parallel
|
|
|
Hydrogen Fuel cell
|
Creates electricity and heat through electrochemical process that converts hydrogen and oxygen to water
|
|
|
Thermodynamics
|
The study of the effects of work, heat flow, and energy on a system
|
|
|
Thermal energy transfer
|
The transfer or movement of thermal energy
|
|
|
What is a design team?
|
A team is a collection of individuals, each with his or her own expertise, brought together to benefit a common goal.
|
|
|
Design process
|
a systematic problem-solving strategy
|
