Moorpark College Physics 10AL Lab Team #: Section:10 A Date: ZIE Partner\'s Name

Question

Moorpark College Physics 10AL Lab Team #: Section:10 A Date: ZIE Partner's Names: Lider Measuring the Force of a Muscle Purpose: To measure the force produced by the biceps muscle of each student in the class and statistically analyze the results Required Equipment Weight hanger, support strap, slotted weight set, elbow pads, PowerMac with Excel software. Discussion: The theory of the forces involved in the arm is covered in detail in your textbook and may have been discussed in lecture. As shown in the figures below, the forearm and musculature of the upper arm can be analyzed as a system of forcesP about a common pivot point, the elb roducing torques ow joint (point O in the lower figure). Radius body Fi When the lower arm is in a horizontal position and loaded with an external force F., the force produced in the biceps muscle is given by the formula, where all of the forces are measured in newtons and the distances in meters (or cm if you wish, it doesn't matter, do you see why?). Page 5-1

Explanation / Answer

WEAKNESS:

1.People who "work out" regularly with weights can "curl" 20 or 25 pounds with one hand.

2.However, the biceps were strong enough to hold heavy weight on the palms, but the forearms were not enough muscular to coordinate with the biceps muscle which ultimately results in holding lighter weight than potential.

3.Bad Posture causes back strain. Elbow and shoulder joint should be in a vertical straight line, whereas elbow and palm should be in horizontal straight line. So that a student can lift maximum weight and note down better observation.

POTENTIAL WAYS OF IMPROVING THE ACCURACY OF RESULTS:

1.Noting down the observations correctly.

2.Measuring the distances very carefully and precise.

3.Not holding the weights until and unless you are being observed because holding the weight in the mean time will cause strain in muscles which requires some time to recover maximum strength.Hold the weight only for observation.

4.Holding the weight in the correct posture to prevent unexpected strain and get best results.

5.Wrist strap should be placed correctly,even small movement will change its position which will result in wrong measurement of distance.

CORRECTION FACTOR:

For an 'Average' young male, 183m high, the distance from elbow joint to the center of palm is 35cm.However, all students are not same, everybody has different dimensions.

So,dividing r4 by 35 and then multiplying the standard values of r2,r3,and f3 by the correction factor obtained for all the students whether they are male or female, tall or short, will not give precise results.

Therefore, the correcion factor is not a good alaytical factor to obtain precise result but it helps in calculating a nearby rough value of the distances and forces. Some students have exceptionally long arms an girls usually has smaller structures of arms.Males will have more accurate results than girls.

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