Physics
A single fixed pulley is used because it:
- has a mechanical advantage greater than 1
- has a velocity ratio less than 1
- gives 100% efficiency
- helps to apply the effort in a convenient direction.
Machines
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Answer
helps to apply the effort in a convenient direction.
Reason — A single fixed pulley changes the direction of the force needed to lift an object. However, it doesn't provide a mechanical advantage greater than 1 or a velocity ratio less than 1, nor does it guarantee 100% efficiency.
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Related Questions
A fire tongs has its arms 20 cm long. It is used to lift a coal of weight 1.5 kgf by applying an effort at a distance 15 cm from the fulcrum.
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(i) the mechanical advantage of fire tongs and
(ii) the effort needed.
The pulley system is used in a machine:
- for gain in energy
- as a force multiplier
- as a force multiplier and for a gain in energy
- none of these
The figure given below shows a fixed pulley used by a boy to lift a load of 200 N through a vertical height of 5 m in 10 s. The velocity ratio of the pulley is
- 0
- 1
- 2
- none
The mechanical advantage of an ideal single movable pulley is:
- 1
- 2
- less than 2
- less than 1.