Physics
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
Machines
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Answer
1
Reason — The velocity ratio of a single fixed pulley is 1. If the point of application of effort E moves a distance d, then the load L also moves the same distance d upwards.
i.e. if dE = dL = d then V.R. = 1
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Related Questions
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
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.
The mechanical advantage of an ideal single movable pulley is:
- 1
- 2
- less than 2
- less than 1.
Which of the following statements is incorrect?
- The velocity ratio of a single fixed pulley is always 1.
- The velocity ratio of a single movable pulley is always 2.
- The velocity ratio of a combination of n movable pulleys with a fixed pulley is always 2n.
- The velocity ratio of a block and tackle system is always equal to the number of strands of the tackle supporting load.