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Machines and movement ratio (velocity ratio).
A machine is a device that can change the magnitude and line of action of a force.
- pulley systems
- gear systems
A simple machine amplifies the input force (effort) to a larger output force (load).
The movement ratio (or velocity ratio) of a machine is defined as the ratio of the distance moved by the effort to the distance moved by the load. Movement ratio can be expressed as
Mr = se / sl
= velocity ratio (1)
Mr = movement ratio
se = distance moved by the effort (m, ft)
sl = distance moved by the load (m, ft)
The efficiency of a simple machine is defined as the ratio of the force ratio to the movement ratio and can be expressed as
μ = Fr / Mr (2)
μ = machine efficiency
Fr = force ratio
Motion - velocity and acceleration, forces and torque.
Forces, acceleration, displacement, vectors, motion, momentum, energy of objects and more.
The connecting rod mechanism.
The force ratio is the load force versus the effort force.
Pulley (Sheave) selection charts for motors ranging 850 - 3450 rpm.
Pulleys, blocks and tackles.
The relative values between quantities - ratios and proportions.
Screw jacks and effort forces.
A toggle joint mechanism can be used to multiply force.
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