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;
15 Cards in this Set
- Front
- Back
Force
|
Newtons (N)
Load Effort |
|
Mechanical Advantage: Meaning
|
M.A. greater than 1.0 = easier
M.A. less than 1.0 = harder --> resistance training --> speed advantage --> distance advantage |
|
Mechanical Advantage: Calculations
|
Forces: M.A. = Load Force/Effort Force
Distance: M.A. = Effort Arm/Load Arm |
|
Friction
|
resistance to moving
STOPPING!!! |
|
Energy
|
Joules (J)
ability to do work |
|
Work
|
W = Force in N x Distance in m
measured in Joules Criteria: apply force & move a distance |
|
Efficiency
|
%
wanted work/work put in x 100% |
|
Systems
|
linkages - eg. chain
transmission - step |
|
Systems: Evaluate
|
1. Effiency
2. Design 3. Functions 4. Environment 5. Convenience 6. Cost 7. Aesthetics |
|
Simple Machines
|
device that simplifies a task
reduces effort |
|
Simple Machines: Wedge, Screw, Wheel + Axle
|
1. Wedge
2. Screw - twisted inclined plane 3. Wheel + Axle |
|
Simple Machines: Pulley
|
Movable - M.A. = count # of strings holding up the mass
Fixed - M.A. = changes direction, not really a simple machine |
|
Levers: Terminology
|
load, effort, fulcrum, load & effort arm (from fulcrum to point)
|
|
Levers: Classes
|
Class 1 - fulcrum in the middle; distance advantage
Class 2 - load in the middle; strength advantage Class 3 - effort in the middle; speed advantage |
|
Levers: Calculations
|
M.A. = Load Force/Effort Force
M.A. = Effort Arm/Load Arm |