Complete concept of moment of force or Turning effect of force class 8th ICSE physics

Complete concept of moment of force or Turning effect of force class 8th ICSE physics
Turning effect of force
A force may cause an object to turn about a pivot. The turning effect of a force is called the moment of the force.
1. When you apply force on the handle of a door, the door turns around the hinges.
2. When you applies force using foot on the pedal of a bicycle, the pedal turns about the pedal axis.
3. When a key is put into a lock and force is applied on it, the key moves.
Factors affecting turning effect of force:
Greater the magnitude of force applied, greater will be turning of an object.
2. Perpendicular distance of the force from the point of pivot.
On combining the two factors , turning moment of force is given by:
Torque = force ( F ) X perpendicular distance ( d )
Clockwise moments
Anti-Clockwise moment
Units of Moment of force
Moment of force = Force x perpendicular distance
SI Unit of Moment of force =
SI Unit of Force x SI Unit of distance
SI Unit of Moment of force = N x m
Relationship between S.I and C.G.S unit of Force
1 N m = 107 dyne cm
Some examples and application of moment of force.
1.A handle is fixed on a door at the maximum possible distance from the hinges.
2. We prefer to use a spanner with long arm.
3. A mechanic use a screwdriver of long and thick arm.
4. The hand operated flour grinder used in village homes is provided with a handle near its rim.

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