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Forces terminology

QuestionAnswer
Work Input equation Wi=Fi x Do
Work output equation Wo=Fo x Do
IMA equation IMA= Di/ Do
AMA equation AMA=Fo/ Fi
Machine Devise that makes work easier
Complex machine Combination of machines
Input force (Fi) Effort force (force applied to the machine)
Output force(Fo) Resistance force (force applied by the machine
Input distance (Di) Effort distance
Output distance (Do) Resistance distance (usually height lifted)
Work input (Wi) Work we put in
Work output (Wo) Work we get out of a machine (always less than Wi)
Efficiency (E) Measure of how well Wi is turned into Wo (always measureed in %
Mechanical advantage The number of times a machine multiplies effort force
Ideal Mehcnaical Advantage (IMA) The number of times a machine should multiply force
Actual mechanical advantage (AMA) The number of times a machine actually multiplies force takes friction into account.
Inclined plane Sloping surface used to raise objects
Lever Bar free to pivot about a fixed point
1st class lever Changes direction of force, IMA can be greater than one
2nd class lever Does not change direction of force IMA will always be greater than one
3rd class lever Does not change direction of force IMA will always be less than one
Pulley Grooved wheel with a rope running around the groove (IMA-number of supporting ropes)
Single-fixed pulley Changes direction of force IMA=1
Single-moveable pulley Doesn't change direction IMA=2
Combo pulley (block and tackle) Some change direction IMA=depends on number of pulleys
Wheel and axle Two wheels of different size rotating together
Screw Ramp wrapped around a cylinder IMA is determined by the pitch (higher the pitch the lower the IMA)
Wedge Two ramps put together back to back
Bionics The Science of designing artificial replacements for parts of the human body
Prosthesis Artificial replacement parts
Created by: Makaylaoldham
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