In a class-three lever, the distance between the effort and the load is 40 cm and load arm is 1 m long. Find the length of the effort arm and then calculate the mechanical advantage.

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Solution

Explanation:
Step 1: Given
Length of the load arm $= 1 m = 100 c m$
Distance between the effort and the load $= 40 c m$
Step 2 :
Length of the effort arm $=$ $(l e n g t h o f l o a d a r m) - (d i s \tan c e b e t w e e n t h e e f f o r t a n d t h e l o a d)$ .
Length of the effort arm $= 100 c m - 40 c m$
So, the length of the effort arm $= 60 c m$
Mechanical advantage $= \frac{e f f o r t a r m}{l o a d a r m}$
Mechanical advantage $= \frac{60 c m}{40 c m}$
Mechanical advantage $= \frac{60}{40} = \frac{3}{2}$
So, Mechanical advantage $= 1.5$
Hence, the length of the effort arm $60 c m$ and Mechanical advantage $1.5$

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