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प्रश्न
Where can a body execute free vibrations?
उत्तर
The free vibrations of a body actually occur only in the vacuum because the presence of a medium offers some resistance due to which the amplitude of vibration does not remain constant and decreases continuously.
Thus, we define free vibrations as the periodic vibrations of a body of constant amplitude in the absence of any external force on it.
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संबंधित प्रश्न
A half metre rod is pivoted at the centre with two weights of 20gf and 12gf suspended at a perpendicular distance of 6 cm and 10 cm from the pivot respectively as shown below.
1) Which of the two forces acting on the rigid rod causes clockwise moment?
2) Is the rod in equilibrium?
3) The direction of 20 kgf force is reversed. What is the magnitude of the resultant moment of the forces on the rod?
Less force is needed when applied at a farther distance from the pivoted point.
What are non-contact forces? Give two example
State the relationship between force, mass and acceleration. Draw graphs showing the relationship between Acceleration and mass for a constant force.
State two factor on which moment of force about a point depends.
Classify the following amongst contact and non-contact forces.
Frictional 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.
Calculate the resultant moment of forces about O and state its direction in fig.
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.
The diagram shows a uniform metre rule weighing 100gf, pivoted at its centre O. Two weights 150gf and 250gf hang from the point A and B respectively of the metre rule such that OA = 40 cm and OB = 20 cm. Calculate :
the total clockwise moment about O
