Essay

Topics: Simple machine, Mechanical advantage, Lever Pages: 3 (427 words) Published: May 18, 2013
SAMPLE PROBLEMS:

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Simple Machines – Lever
A first class lever in static equilibrium has a 50lb resistance force and 15lb effort force. The lever’s effort force is located 4 ft from the fulcrum.

Sketch and annotate the lever system described above.
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What is the actual mechanical advantage of the system?
Formula| Substitute / Solve| Final Answer|
| | AMA = 3.33|
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Using static equilibrium calculations, calculate the length from the fulcrum to the resistance force. Formula| Substitute / Solve| Final Answer|
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A wheel barrow is used to lift a 200 lb load. The length from the wheel axle to the center of the load is 2 ft. The length from the wheel and axle to the effort is 5 ft.

Illustrate and annotate the lever system described above.
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What is the ideal mechanical advantage of the system?
Formula| Substitute / Solve| Final Answer|
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Using static equilibrium calculations, calculate the effort force needed to overcome the resistance force in the system. Formula| Substitute / Solve| Final Answer|
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A medical technician uses a pair of four inch long tweezers to remove a wood sliver from a patient. The technician is applying 1 lb of squeezing force to the tweezers. If more than 1/5 lb of force is applied to the sliver, it will break and become difficult to remove.

Sketch and annotate the lever system described above.
|

What is the actual mechanical advantage of the system?
Formula| Substitute / Solve| Final Answer|
| | |

Using static equilibrium calculations, calculate how far from the fulcrum the tweezers must be held to avoid damaging the sliver Formula| Substitute / Solve| Final Answer|
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Simple Machines – Screw
A 7/16 nut driver with a 1 1/2 inch diameter handle is used to install a ¼ 20 UNC bolt into a robotic arm.

Sketch and annotate the screw system...
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