A crowbar is used as a lever. The effort force of 40 newtons moves 3 meters. The resistance force of 54 newtons moves 2 meters. What is the efficiency of the lever?

Question

A) 100% because energy must be conserved
B) 90%
C) 25%
D) 18%
 
i need help. i don't know how to figure this one out

drwls · Answer

Output work = 108 J. Input work = 120 J Efficiency = 108/120 = 9/10 = 90% (Energy can be converted to heat in friction at the fulcrum, or useless potential energy distorting the crowbar)

Nella · Answer

oh okay. i get it now. Thank you very much

Helen · Answer

Southeast Academy Switched-on online?

Anonymous · Answer

What is the unit for IMA?

phillip · Answer

IMA is unitless

billy · Answer

yes

Anonymous · Answer

A crowbar is used as a lever. The effort force of 40 newtons moves 3 meters. The resistance force of 54 newtons moves 2 meters. What is the efficiency of the lever?