Engineering an Arm

Prelab:

1. a. From Rotational Equilibrium, We can get |Fi|=5|Fo|.

b. Since the lever is not moving, the sum of forces should be zero, thus the force at the fixed end should have a magnitude of 4|Fo| with pointing downwards.

2. Under rotational equilibrium, the magnitudes of the torques are equal to each other. Thus the Mechanical Advantage, which is defined as the ratio of the output force and the input force, can be translated to a ratio of the distances since

. Thus

Report:

0. Comments:

INCLUDE data TABLES, as well as the FIGURES, in the report! Do not just give me the final answer. The data file is only the raw data and the low-resolution of the file will not allow me see the detailed information.

1. Model of the arm:

(You can google the modeling, it is allowed!)

(A "model" is a simplification for complexed things, do not describe your model using half a page --- that's redundant.)

Use a lever to model an arm, see Fig 1, and the problem will be simplified as Prelab1.

There's only one thing to note, that your hand should pointing outwards, not inwards (Fig 1 is wrong, but that's the best image I can get).

The important points are: where is the pivot, what are the distances for the effort, and the load, as well as the measurements/determination of them.

Fig 1. Model of an Arm (Source: link)

2. Please master the significant digits including rounding a value and how to use a caliper, and please follow the proper styles for tables and figures.