Unit 8 · Simple Machine

The Pulley

ScienceSubject

8 minEstimated read

क्रियाकलाप 8.2

Lifting a load with fixed, movable and combined pulleys

Method

Set up a one wheel fixed pulley, a one wheel movable pulley and a combined pulley system.
Using a spring balance, lift the given load with each pulley system turn by turn.
Measure with a scale how far the effort had to be pulled to raise the load 20 cm.
Collect the data from this activity and fill it in a table like the one below.

Type of pulley	Load distance (l.d.)	Effort distance (e.d.)	e.d. ÷ l.d.	Load	Effort	Load ÷ Effort	Work done = Effort × e.d.	Work obtained = Load × l.d.

Discussion

Calculate from your data and solve the questions asked below.
What is the difference between the pulley shown in the first picture and the pulley shown in the second picture?
What is the relation between the ratio of effort distance to load distance and the number of pulleys?
In which pulley system is the ratio of load to effort the smallest, and in which is it the largest?
In which places have you seen such pulleys being used?

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