Bright Tutorials Bright Tutorials
ICSE Class 10 Physics Question 20 of 25

Model Paper 1 — Question 10

Back to all questions
10
Question

Question 7(i)

A block and tackle has two pulleys in each block with the tackle tied to the hook of the lower block and the effort being applied upwards.

(a) Draw a neat diagram to show this arrangement and calculate its mechanical advantage.

(b) If the load moves up by a distance x, by what distance will the free end of the string move up?

Answer

(a) The arrangement is shown in the figure given below :

The arrangement is shown in the figure given below. Concise Physics Solutions ICSE Class 10.

Here, the load is being supported by five segments of the string.

∴ L = 5T and E = T

Then,

M.A. = LE\dfrac{\text{L}}{\text{E}}

= 5TT\dfrac{\text{5T}}{\text{T}} = 5

∴ Mechanical advantage of the system is 5.

(b) In an ideal block and tackle system, if n segments of rope support the load, then the total length of the rope pulled = n × x.

As, here the load is being supported by five segments of the string then if the load moves up a distance x,

then,

Free end of the string will move up by a distance = 5x