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प्रश्न
In which direction does the force need to applied, when a single pulley is used with a mechanical advantage greater than one? How can you change the direction of force applied without altering its mechanical advantage? Draw a labelled diagram of the system.
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उत्तर
A single movable pulley can be used to obtain an M.A. greater than 1, but this is impractical as it requires exerting force in an upward direction. Instead, a fixed pulley is used in conjunction with the movable pulley to apply force in a downward direction.
The only purpose of a fixed single pulley is to shift the force's application direction in a direction that is convenient.
M.A. = `(2T)/T = 2`
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संबंधित प्रश्न
A pulley system with VR = 4 is used to lift a load of 175 kgf through a vertical height of 15 m. The effort required is 50 kgf in the downward direction. (g = 10 N kg-1)
Calculate:
- Distance moved by the effort
- Work done by the effort
- M.A. of the pulley system
- Efficiency of the pulley system
Fill in the blank:
A pulley is used to change ........................
What is the mechanical advantage of an ideal pulley?
Differentiate between a single fixed pulley and a single movable pulley.
Explain how a gear system can be used to obtain Change in direction of rotation. Given one example.
Define the following term in reference to a gear system of Driving gear ?
Define the following term in reference to a gear system for Gain in speed ?
Give reason for the following:
The lower block of a block and tackle pulley system must be of negligible weight
What is a pulley?
