Advertisements
Advertisements
प्रश्न
Give reason for the following:
In case of a block and tackle system, the mechanical advantage increases with the increase in the number of pulleys.
Advertisements
उत्तर
In a block and tackle system, if the total number of pulleys used in both the blocks is 'n' and the effort is being applied in the downward direction, then the tension in and segments of string support the load. therefore
L = n T and E = T
M.A = `"load"/"effort" = "nT"/"T" = "n"`
Thus in a block and tackle system, the M.A is equal to the number of pulleys and it increases with the increase in the number of pulley.
APPEARS IN
संबंधित प्रश्न
A boy uses a single fixed pulley to lift a load of 50 kgf to some height. Another boy uses a single movable pulley to lift the same load to the same height. Compare the effort applied by them. Give a reason to support your answer.
Select the correct alternative:
A pulley is used because of it
Define the following term in reference to a gear system for Driven gear ?
Define the following term in reference to a gear system for Gain in speed ?
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.
What is the use of a fixed pulley?
Give reason for the following:
The efficiency of a pulley is always less than 100%
If the weight of the movable pulley is W, obtain the expression for MA, VR, and efficiency.
_______ is a machine made up of wheel and rope.
| Meera chose to use a block and tackle system of '9' pulleys instead of a single movable pulley to lift a heavy load. |
Why should she connect more number of pulleys in the upper fixed block?
