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प्रश्न
State the effects that a force can produce. Given one example of each.
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उत्तर
A force can produce the following three effects:
(i) It can bring changes in dimensions. For example, in stretching a spring its length increases.
(ii) It can start or stop motion. For example, a ball moves when kicked.
(iii) It can change the speed or direction of motion. For example, a hockey player changes the speed and direction of the motion of the ball by his stick.
संबंधित प्रश्न
Where can a body execute free vibrations?
Moment of force = force × perpendicular distance of force – from the pivoted point.
Less force is needed when applied at a farther distance from the pivoted point.
To obtain a given moment of force for turning a body, the force needed can be decreased by
State the effect of force F in of the following diagram.
A car of mass 600 kg is moving with a speed of 10 m-1 while a scooter of mass 80 kg is moving with speed of 50 m s-1. which vehicle will require more force to stop it in the (1) same interval of time (2) same distance
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 wheel O pivoted at point A. Three equal forces F1, F2 and F3 act at point B on the wheel.
- Which force will produce maximum moment about A?
- Give a reason for your answer in (a).
