Advertisements
Advertisements
प्रश्न
A jack screw is provided with a long arm. Explain why?
Advertisements
उत्तर
A force is supplied at a position on the body where the distance from the axis is maximum in order to maximise the screw jack's turning effect. In order to give the screw jack the highest torque possible given the supplied force. The formula for the turning effect of the body is moment of force (torque) = force applied × perpendicular distance of force from the axis of rotation.
As a result, the jack screw may apply more force the longer its arm.
APPEARS IN
संबंधित प्रश्न
Classify the following amongst contact and non-contact force.
force of tension in a string
A spanner (or wrench) has a long handle. Why?
Two forces each of magnitude 10 N act vertically upwards and downwards respectively at the two ends A and B of a uniform rod of length 4 m which is pivoted at its midpoint O as shown in the figure. Determine the magnitude of the resultant moment of forces about the pivot O.
Give an example for each of the following uses of a machine:
to change the point of application of force
A wheel of diameter 3 m is shown in fig. 2 with axle at 0. A force F = 8 N is applied at Q in the direction shown in figure. Calculate the moment of force about:
(i) centre o, and
(ii) point p.
Three forces A, B and C are acting on a rigid body which can turn about O in fig.9. If all the three forces are applied simultaneously, in which direction will the body move? Explain.
How does the distance of separation between two bodies affect the magnitude of the non-contact force between them?
State two factors on which moment of the force about a point depends.
A door lock is opened by turning the lever (handle) of length 0.2 m. If the moment of force produced is 1 Nm, then the minimum force required is ______.
