Waec Model Questions Vol1 2021 Physics Question 6

Practice essay / theory question 6 from the 2021 Waec Model Questions Vol1 Physics examination. This question covers Machines, Mechanical advantage, Efficiency, Work and energy .

Waec Model Questions Vol1 2021 Physics Essay / Theory

Topics: Machines Mechanical advantage Efficiency Work and energy

Question 6 WAEC_MODEL_QUESTIONS_VOL1 • 2021 • PHYSICS • essay

A lifting system consists of a fixed pulley attached to the ceiling and a movable pulley attached to a load of 15.0 kg. The rope passes over the fixed pulley, under the movable pulley, and is pulled vertically upward with a constant effort of 120 N. The pulleys are assumed to be massless and frictionless.

Question Parts

( a )

Determine the mechanical advantage (MA) of the system based on the actual load and the applied effort.

( b )

For an ideal (frictionless) movable‑pulley arrangement the theoretical MA is 2. Using the given effort, calculate the ideal load that could be lifted and then state the efficiency of the actual system.

( c )

If the rope stretches uniformly by 0.05 m when the load is raised 2.0 m, estimate the work lost in stretching the rope and discuss its effect on the overall efficiency of the system.

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About This Question

This is Waec Model Questions Vol1 2021 Physics Question 6. It is one of the essay questions from the 2021 Waec Model Questions Vol1 Physics examination.

The question covers Machines, Mechanical advantage, Efficiency, Work and energy .

View More Waec Model Questions Vol1 2021 Physics Questions More Waec Model Questions Vol1 Practice Questions Back to Questions

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