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# Torque

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by

## Maha ALS

on 13 May 2014

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#### Transcript of Torque

Case 2
Case 1
Definition of torque
The tendency of a force to rotate an object about some axis.
Equipment
• Meter stick (1) - no metal ends
• Weight Hanger (1)
• Fulcrum (1)
• Mass Set (1)
• Clamps (4)

Torque
Torque(τ ) = r F sinϕ =Fd

F=
The applied force.

r=
is the distance between the rotation axis and the point of application of F.
d=
is the perpendicular distance from the rotation axis to the line of action of F.
θ=
is the angle between the force and the lever arm.
The( SI) unit of torque is a
N.m
Torque is a vector quantity.
The sign of torque is taken to be positive
(+)
if the force tends to produce counterclockwise rotation and negative
(-)
if the force tends to produce clockwise rotation about an axis.
Procedure
With the meter stick on the support stand, suspend a mass
m1= 100g
at the
3.5cm
mark on the meter stick. Then adjust the lever arm for a mass
m2= 200g
at the other end of the meter stick and adjust its position until the system is in static equilibrium. Using,
∑τ= 0
Result
Length of meter stick=
37cm
x0=
37/2 = 18.5cm
r1=
x0– x1
r2=
x2 – x0
% Difference =
100 (τcc - τcw) / [(τcc + τcw)/2]

Procedure
Place
m1= 200g
at the
15cm
from rotation center and Place an any mass m2 that safeties
τcc ˃ τcw
at other side of rotation center at same position.
Result
Case 3
Procedure
Place
m1= 150g
at the
14cm
from rotation center. Then place mass
m2 =150g
at any position that safeties
τcc ˃ τcw.

Result
Discussion
Foundation of Biomechanics, BIOEN 312

Conclusion
References
Haneefa Barnawi
Maha Al-Shammari Maram Alqarni
Zahrah Alali
Error causes:
Human Errors
The arm stability
The definition for torque as
M = Frsinϕ
holds true under
differing masses and distances
from point of rotation.
The angle of applied force wasn't considered.
1. JEWETT, J. W., SERWAY, R. A., & PEROOMIAN, V. (2010). Physics for scientists and engineers. Vol. 1 Vol. 1. [Pacific Grove], Brooks/Cole Cengage Learning.
2. KNIGHT, J., & SCHLAGER, N. (2002). Science of everyday things. Detroit, Gale Group.
3. LERNER, K. L., & LERNER, B. W. (2008). Gale encyclopedia of science. Detroit, Thomson Gale.
4. NORDIN, M., & ÖZKAYA, N. (2012). Fundamentals of biomechanics: equilibrium, motion, and deformation. New York [u.a.], Springer.
5. OKUNO, E., & FRATIN, L. (2014). Biomechanics of the human body. New York, Springer.

Aim
The aim of our experiment is to apply the principle of torque and to see how torque is affected by force and distance.
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