Class-8/Simple machine related formula and numerical./Principle of lever .MA?/VA?/Efficiency ?

#Amrita_budha,#class 8.#Simple machine related formula. #simple machine related numerical .#Principle of lever. #MA?,#VA?,#Efficiency ?#numerical of simple machine. #formula of simple machine.
1. A load of 400 N is lifted up by an effort of 100N .If load distance is 20 cm ,what will be the effort distance?
2.Two boys, Shrijan having weight 600 N and Shrijesh having weight 300 N are playing see saw .If Shrijan is setting at 2m from fulcrum ,where should Shrijehs sit from fulcrum to balance Shrijan ?
3.A lever of length 1m has been used to lift a load of 600N by applying an effort of 200N .If load is at 20 cm from fulcrum ,calculate mechanical advantage, velocity ratio and efficiency.
d. Study the figure below and find the value of effort

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