10. Explain the moment of force with diagram and formula
for (a) the steering wheel of a car (b) the pedal and
rear wheel of a bicycle.
Answers
Answer:
FACTORS AFFECTING TURNING OF A BODY - DEFINITION
The turning of a body by a force depends on the following two factors:
1. The magnitude of the force applied
2. The distance between the line of action of force and the axis of rotation (or pivoted point)
EXAMPLES OF TURNING EFFECT OF FORCE - DIAGRAM
(1) To open and shut a door, we apply a force (push or pull) normal to the door at its handle P which is at the maximum distance from the hinge.
(2) The upper circular stone of a hand flour grinder is provided with a handle near its rim (i.e. maximum distance from the centre) so that it can easily be rotated about the iron pivot at its centre by applying a small force at the handle.
(3) For turning a steering wheel, a force is applied tangentially on the rim of the wheel.
(4) In a bicycle, to turn the wheel anticlockwise, a small force is applied on the pedal of a toothed wheel.