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WAEC Physics questions: Simple machines

11 questions with answers and explanations. Tap an option to check yourself.

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  1. Question 1· Simple machines· WAEC

    A pulley system of velocity ratio 3 lifts a load of 300 N with an effort of 125 N. Find its efficiency.

    Explanation and discussion

  2. Question 2· Simple machines· WAEC

    The efficiency of a machine is always less than 100% because

    Explanation and discussion

  3. Question 3· Simple machines· WAEC

    An inclined plane is 5 m long and 1 m high. Its velocity ratio is

    Explanation and discussion

  4. Question 4· Simple machines· WAEC

    A machine has a mechanical advantage of 4 and a velocity ratio of 5. Find its efficiency.

    Explanation and discussion

  5. Question 5· Simple machines· WAEC

    A screw jack has a pitch of 0.5 cm and its handle turns in a circle of radius 35 cm. Find the velocity ratio. [π = 22/7]

    Explanation and discussion

  6. Question 6· Simple machines· WAEC

    A pulley system lifts a 600 N load with an effort of 200 N. The mechanical advantage is

    Explanation and discussion

  7. Question 7· Simple machines· WAEC

    In a pulley system the load is supported by 4 strands of rope. What is the velocity ratio?

    Explanation and discussion

  8. Question 8· Simple machines· WAEC

    A pulley system lifts a load of 600 N with an effort of 200 N. Its mechanical advantage is

    Explanation and discussion

  9. Question 9· Simple machines· WAEC

    A machine of velocity ratio 5 lifts a load of 400 N with an effort of 100 N. Find its efficiency.

    Explanation and discussion

  10. Question 10· Simple machines· WAEC

    A machine has a velocity ratio of 5 and an efficiency of 80%. Its mechanical advantage is

    Explanation and discussion

  11. Question 11· Simple machines· WAEC

    In a first-class lever, the fulcrum is

    Explanation and discussion

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