What is work?
Transfer of energy through motion
2 things that must be present for work to actually occur
1. There must be motion
2. Motion must be in the same direction as the force
Formula for work
Force • Distance = work
Work ÷ time = power
What is a machine?
Something that makes work easier
-Wheel and axle
Simple machine examples
Lever- seesaw, crow bar
Pulley- window blinds, sailboat pulleys
Wheel and axle- ferris wheel, door nob, car tire
Inclined plane- staircase, ramp
Screw- screws, spiral staircase, vice
Wedge- knife, wood stopper
a rigid bar that pivots around a fulcrum
a wheel and axle with a grove and a rope and chain connected to it
wheel and axle definition
a wheel that rotates around a shaft (axle)
inclined plane definition
a sloping surface
spiral inclined plane around a cylinder
inclined plane with 2 sloping sides
MA = effort arm length / resistance arm length
count all the ropes besides the one that is being pulled down
wheel and axle MA formula
wheel radius ÷ axle radius = MA
inclined plane MA formula
length ÷ height = MA
closer the threads are the higher the MA
thinner the blade the higher the MA
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