simple machines - intro
TRANSCRIPT
Simple machines:• Reduce the effort (force multiplier)
• Change point of application of effort to a convenient point
Simple machines:• Reduce the effort (force multiplier)
• Change point of application of effort to a convenient point
• Change the direction of effort
Simple machines:• Reduce the effort (force multiplier)
• Change point of application of effort to a convenient point
• Change the direction of effort
• Produce a gain in speed
Simple machines:• Reduce the effort (force multiplier)
• Change point of application of effort to a convenient point
• Change the direction of effort
• Produce a gain in speed
• Load
• Effort
• Mechanical advantage, M.A. = Load (L)Effort (E)
L > E - M.A. > 1 – force multiplierE > L - M.A. < 1 – gain in speedE = L - M.A. = 1 – changes direction of effort
(no change in force/speed)
Units
Technical terms
• Velocity ratio, V.R. = Velocity of effort (VE)Velocity of load (VL)
V.R. = dE/t
dL/t
V.R. = dE
dL
dE > dL – V.R. > 1 – force multiplierdL > dE – V.R. < 1 – gain in speeddL = dE – V.R. = 1 – changes direction of effort
(no change in force/speed)Units
Technical terms
Technical terms• Work input• Work output
MachineEffort Load
Work input
Work outputEfficiency, η =
Units