Moment of force biomechanics

The turning effect of a force applied to a rotational system at a distance from the axis of rotation. The moment is equal to the magnitude of the force multiplied by the perpendicular distance between its line of action and the axis of rotation.

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1. Prepared by Atheena Pandian
BIOMECHANICS
MOMENT OF FORCE
OR
TORQUE

2. WHAT WE'LL
DISCUSS
What is Moment of
Force?
SI Unit
Calculation
Solved Example
Applications in
Biomechanics
1.
2.
3.
4.
5.

3. A moment is the turning effect of a
force. Moments act about a point in a
clockwise or anticlockwise direction.
WHAT IS MOMENTS?
BIOMEHANICS

4. The turning effect of a force applied to a
rotational system at a distance from the
axis of rotation.

The moment is equal to the magnitude of
the force multiplied by the perpendicular
distance between its line of action and
the axis of rotation.
WHAT IS MOMENT OF FORCE?
BIOMEHANICS

5. SI UNIT OF
MOMENT OF
FORCE

NEWTON-METRE (NM).

IT IS A VECTOR
QUANTITY.

6. Force
Distance
Right
Moment
Angle

7. Force
Distance
Right
Moment
Angle
The moment of a force or torque, r is
defined as the turning effect of the force
about a pivot and is the product of the
force (F) and the perpendicular distance
(d) from the line of action of the force to
the pivot.

8. MOMENT OF FORCE
For example imagine pushing a door open. You
push on the door handle and the door rotates
around its hinges (the hinges are a pivot).

You exerted a force that caused the door to rotate
– the rotation was the result of the moment of
your pushing force.

9. MOVEMENT OF THE FORCE
A force is any interaction that, when unopposed, will
change the motion of an object.

A force can cause an object with mass to change its
velocity (which includes to begin moving from a state of
rest), i.e., to accelerate.

A force has both magnitude and direction, making it a
vector quantity.
ALL MOVEMENT OF THE
FORCE IS NOT A MOMENT
OF FORCE

10. MAGNITUDE
DIRECTION
COMPONENTS ARE
1.
2.
PRINCIPLE OF MOMENTS

11. Calcuation of Moment
of Force
Biomechanics

The Moment of a force is a measure of its tendency to
cause a body to rotate about a specific point or axis. ...

The magnitude of the moment of a force acting about
a point or axis is directly proportinoal to the distance
of the force from the point or axis.

12. Calcuation of Moment
of Force
Biomechanics

13. Unit of Moment of Force is NM but in the above they
mentioned in IBS unit so no worry changed to NM

14. Unit of Moment of Force is NM but in the above they
mentioned in IBS unit so no worry changed to NM

15. Unit of Moment of Force is NM but in the above they
mentioned in IBS unit so no worry changed to NM

16. Unit of Moment of Force is NM but in the above they
mentioned in IBS unit so no worry changed to NM

17. Unit of Moment of Force is NM but in the above they
mentioned in IBS unit so no worry changed to NM

18. APPLICATIONS
HUMAN BIOMECHANICS
Hinje Joint
Surgery
Orthopedic
Implant fixations
All the joint
replacements

19. THANK YOU