Neco Model Questions Vol1 2019 Physics Question 6

Practice essay / theory question 6 from the 2019 Neco Model Questions Vol1 Physics examination. This question covers machines, simple_machines, mechanical_advantage, efficiency, stress_analysis .

Neco Model Questions Vol1 2019 Physics Essay / Theory
Topics: machines simple_machines mechanical_advantage efficiency stress_analysis
Question 6 NECO_MODEL_QUESTIONS_VOL1 • 2019 • PHYSICS • essay

A compound machine is shown in the diagram. It consists of a lever AB pivoted at O (the fulcrum). The effort arm OA is 1.2 m long and the load arm OB is 0.3 m long. A downward effort force is applied at A. From point A a rope passes over a fixed pulley P, then under a movable pulley M that is attached to the same load of weight 150 N hanging at B. The free end of the rope is pulled upward by a hand at C. The hand pulls the rope through a distance of 6.0 m, causing the load to rise vertically by 0.75 m. Answer the following questions:

Question Parts

( a )
The lever and the pulley system each contribute to the overall mechanical advantage. (i) Calculate the mechanical advantage of the lever alone. (ii) Calculate the mechanical advantage of the pulley arrangement alone (ignore friction). (iii) Determine the overall ideal mechanical advantage of the compound machine. (iv) Using the overall ideal mechanical advantage, find the ideal effort force that must be applied by the hand at C to raise the 150 N load.
( b )
In practice the hand must exert a force of 22 N while pulling the rope through 6.0 m to raise the load by 0.75 m. Calculate the efficiency of the compound machine expressed as a percentage.

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About This Question

This is Neco Model Questions Vol1 2019 Physics Question 6. It is one of the essay questions from the 2019 Neco Model Questions Vol1 Physics examination.

The question covers machines, simple_machines, mechanical_advantage, efficiency, stress_analysis .

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