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Transcript of Torque
Definition of torque
The tendency of a force to rotate an object about some axis.
• Meter stick (1) - no metal ends
• Weight Hanger (1)
• Fulcrum (1)
• Mass Set (1)
• Clamps (4)
Torque(τ ) = r F sinϕ =Fd
The applied force.
is the distance between the rotation axis and the point of application of F.
is the perpendicular distance from the rotation axis to the line of action of F.
is the angle between the force and the lever arm.
The( SI) unit of torque is a
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.
With the meter stick on the support stand, suspend a mass
mark on the meter stick. Then adjust the lever arm for a mass
at the other end of the meter stick and adjust its position until the system is in static equilibrium. Using,
Length of meter stick=
37/2 = 18.5cm
x2 – x0
% Difference =
100 (τcc - τcw) / [(τcc + τcw)/2]
from rotation center and Place an any mass m2 that safeties
τcc ˃ τcw
at other side of rotation center at same position.
from rotation center. Then place mass
at any position that safeties
τcc ˃ τcw.
Foundation of Biomechanics, BIOEN 312
Maha Al-Shammari Maram Alqarni
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.
The aim of our experiment is to apply the principle of torque and to see how torque is affected by force and distance.