Waec Model Questions Vol1 2023 Physics Question 6

Practice essay / theory question 6 from the 2023 Waec Model Questions Vol1 Physics examination. This question covers simple machines, mechanical advantage, efficiency, power .

Waec Model Questions Vol1 2023 Physics Essay / Theory
Topics: simple machines mechanical advantage efficiency power
Question 6 WAEC_MODEL_QUESTIONS_VOL1 • 2023 • PHYSICS • essay

The diagram shows a compound simple machine used to lift a load. A fixed ceiling pulley (P1) is attached to the ceiling. A rope passes over P1, descends to a movable pulley (P2) which carries a load of weight 200 N, and then ascends to a lever AB. The lever is hinged at point O. The short arm OA (0.1 m) is attached to the rope, while the long effort arm OH (0.5 m) is where a hand applies an upward force F at point H. The rope and pulleys are assumed mass‑less and the pulleys are frictionless unless otherwise stated.

Question Parts

( a )
Determine the ideal mechanical advantage of the whole system, taking into account both the pulley arrangement and the lever.
( b )
Calculate the magnitude of the input force that must be applied at H to raise the 200 N load at constant speed, assuming the rope and both pulleys are ideal (frictionless and mass‑less).
( c )
If the fixed pulley (P1) operates with an efficiency of 85 % because of bearing friction, while the movable pulley remains ideal, compute the actual input force required at H.
( d )
The operator moves the handle H vertically upward with a speed of 0.30 m s⁻¹. Determine the power output of the system (in watts) under the conditions of part (c). State any assumptions you make.

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About This Question

This is Waec Model Questions Vol1 2023 Physics Question 6. It is one of the essay questions from the 2023 Waec Model Questions Vol1 Physics examination.

The question covers simple machines, mechanical advantage, efficiency, power .

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