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