Draw a diagram. Show work including calculations and equations. Write an explana

Question

Draw a diagram. Show work including calculations and equations. Write an explanation in words if needed. In a lab activity you set up a pulley system. You lift a weight of 1345N from the floor to a height of 0.975m. You had to pull the rope a distance of 3.9m and exert a force of 375N. What is the ideal mechanical advantage? a. 1 b. 2 c. 3 d. 4 e. 5 What is the mechanical advantage? a. 2 b. 2.8 c. 3.1 d. 3.6 e. 4 How efficient is the system? a. 70% b. 80% c. 90% d. 100% e. 105% Draw the pulley system:

Explanation / Answer

a) the ideal mechanical advantage is 1

b) MA = force produced/ force applied = 1345/375 = 3.5966 =3.6 (approx.)

c) efficiency - MA/speed ratio = 3.6x 0.975/3.9 = 0.9 [SR = Dinput/ Doutput]

so in percentage = 90 % .............option c)

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