Topic 1: Statics Flashcards
Crow bar
First-class lever, iron/steel bar used to wedge under an object to move or lift it
Bicycle
simple machine made of several components: axial, spoke, gear chain, crankshaft, pedals, vehicle used for transportation
Car jack
simple machine used as a lifting device
Linear motion
motion in a straight line
Rotary motion
motion in a circular path, motion about an axis
Oscillatory motion
motion that an object repeats continuously
Reciprocal motion
repetitive back-and-forth linear motion
Mechanical Advantage
MA=load/effort
Velocity Ratio
VR=distance moved by effort/distance moved by load
Efficiency
efficiency= MA/VR x100%
First class lever
Load-Fulcrum-Effort
Second class lever
Fulcrum-Load-Effort
Third class lever
Load-Effort-Fulcrum
Mechanical Advantage of Levers
MA=Load/Effort=distance to effort/distance to load
Velocity Ratio of Levers
VR=distance to effort/distance to load
Reducing Gears
the driver gear is smaller than the driven gear. Acts as a force multiplier but reduces speed
Multiplying Gears
the driver gear is bigger than the driven gear. Acts as a speed multiplier
Velocity ratio of Gears
VR=rpm of driver/ rpm of driven
Gear ratio of Gears
GR=driven/driver
Mechanical advantage of Gears
MA=GR
Efficiency of Gears
MA/VR or GR/VR
Velocity Ratio of Worm drives
VR=number of teeth on worm gear/threads on worm
Gear ratio of Rack and pinion
GR= pinion teeth/rack pitch
Mechanical Advantage of Inclined Planes
MA= load/effort