May 2010
Beginner
620 pages
16h 19m
English
Content preview from Engineering Mechanics
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8
Lifting Machines
INTRODUCTION
Lifting machines are those machines that are used for lifting loads. The force (or effort) is applied at one point of the machine and weight (or load) is lifted at the other point of the machine. Pulleys used to lift water from a well and screw jacks used to lift buses are some of the common examples of lifting machines.
DEFINITIONS
The terms commonly used while dealing with lifting machines are defined below.
Mechanical Advantage
It is the ratio of load (or weight) lifted to the effort applied. Thus, mathematically, mechanical advantage is
Velocity Ratio
It is the ratio of the distance moved by the effort ...
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