# (I) How Many Strands of Tackle Are Supporting the Load? (Ii) Draw Arrows to Represent Tension in Each Stand. - Physics

Short Note

Fig shown a block and tackles system of pulleys used to lift a load.

(i) How many strands of tackle are supporting the load?

(ii) Draw arrows to represent tension in each stand.

(iii) What is the mechanical advantage of the system?

(iv) When load is pulled up by a distance 1 m how far does the effort end move?

#### Solution

(I) 4 stands of tackle are supporting the load.

(ii) correct winding of rope around pulleys, load and effort is as shown:

(iii) M .A = L/E

here,L = 4T, E = T

M.A = (4"T")/"T" = 4

(iv) since there are four strings in the block and tackle system, therefore, the velocity ratio of the system is V.R = n = 4

Now, V.R "d"_"E"/"d"_"L"

or, "d"_"E" = 4 xx "d"_"L" = 4 xx 1 = 4"m"

Is there an error in this question or solution?

#### APPEARS IN

Frank ICSE Class 10 Physics Part 2
Chapter 1 Force, Work, Energy and Power
Exercise 1.3 | Q 4 | Page 29